Last Build Date: Tue, 22 Mar 2016 08:27:51 +0100
Mon, 21 Mar 2016 00:00:00 +0100Conclusions Compared to CPS, FLACS is a safer and more effective method for reducing endothelial cell loss and postoperative central corneal thickening as well as achieving better and faster visual rehabilitation and refractive outcomes. However, there is no difference in final CDVA and surgically induced astigmatism between the two groups. (Source: PLoS One)
Fri, 18 Mar 2016 00:00:00 +0100Conclusions Our results showed that SMILE offered a less favourable astigmatic correction comparable to femtosecond-assisted LASIK in eyes with low to moderate myopic astigmatism. The alignment of treatment was more variable in SMILE, leading to a lower efficacy compared with LASIK by 3 months postoperatively. (Source: British Journal of Ophthalmology)
Fri, 18 Mar 2016 00:00:00 +0100Conclusion There was no significant difference in the average amount of apparent accommodation in pseudophakic eyes with refractive ATR, WTR and minimum astigmatism. However, the factors relevant to apparent accommodation varied depending on the status of postoperative refractive astigmatism. (Source: British Journal of Ophthalmology)
Wed, 16 Mar 2016 05:00:00 +0100A new adaptive method of wavefront sensing is proposed and demonstrated. The method is based on the Talbot self-imaging effect, which is observed in an illuminating light beam with strong second-order aberration. Compensation of defocus and astigmatism is achieved with an appropriate choice of size ... (Source: Applied Optics)
Wed, 09 Mar 2016 00:00:00 +0100Conclusion The refractive and visual results of toric IOL implantation using the 3-point marking method were comparable to the other methods evaluated in this study, although the accuracy of the axis alignment of the toric IOLs was significantly lower than that obtained with the iris pattern method. (Source: Japanese Journal of Ophthalmology)
Tue, 08 Mar 2016 07:21:26 +0100Conclusions: LCT proved to be the best option for treating corneal thinning. AMT represents an alternative that allows good visual recovery but does not restore corneal thickness as efficiently as LCT. (Source: Cornea)
Tue, 08 Mar 2016 07:21:26 +0100Conclusions: Eyelid ptosis modifies anterior corneal surface inducing refractive errors and modifying corneal astigmatism in patients, thus affecting the quality of vision. The surgical correction of blepharoptosis induces anterior corneal surface modification, restoring corneal symmetry and regular corneal astigmatism. Postoperative corneal topography showed normal corneal contours. (Source: Cornea)
Tue, 08 Mar 2016 07:21:26 +0100Conclusions: Both procedures showed preferable outcomes in the correction of moderate and high astigmatism. However, high astigmatism was undercorrected after both procedures. Axial error of astigmatic correction may be one of the potential factors for the undercorrection. (Source: Cornea)
Thu, 03 Mar 2016 00:00:00 +0100Conclusions The differences in the visual and refractive results between flap preservation and flap removal groups were not clinically significant. Both procedures seemed safe and effective for the treatment of myopia and myopic astigmatism. (Source: Saudi Journal of Ophthalmology)
Thu, 03 Mar 2016 00:00:00 +0100Conclusion The modified Ehler’s correction algorithm used in this study can be effectively applied in the normal IOP range in a majority of patients. (Source: Saudi Journal of Ophthalmology)
Wed, 02 Mar 2016 00:00:00 +0100Conclusions The oblique astigmatism (Z 2 −2 ) of the total cornea significantly changed after 2.2-mm-incision cataract surgery. The changes in the lower- and higher-order aberrations of the anterior cornea mainly contributed to the changes in the total cornea. (Source: Japanese Journal of Ophthalmology)
Tue, 01 Mar 2016 00:00:00 +0100Introduction Optic neuritis leads to degeneration of retinal ganglion cells whose axons form the optic nerve. The standard treatment is a methylprednisolone pulse therapy. This treatment slightly shortens the time of recovery but does not prevent neurodegeneration and persistent visual impairment. In a phase II trial performed in preparation of this study, we have shown that erythropoietin protects global retinal nerve fibre layer thickness (RNFLT-G) in acute optic neuritis; however, the preparatory trial was not powered to show effects on visual function. Methods and analysis Treatment of Optic Neuritis with Erythropoietin (TONE) is a national, randomised, double-blind, placebo-controlled, multicentre trial with two parallel arms. The primary objective is to determine the efficacy of ery...
Sat, 27 Feb 2016 07:35:59 +0100Conclusions: Approximately 57.3% of the population 35 years and older in the INK area of Durban were affected by refractive errors, with myopia, hyperopia, and astigmatism being significantly associated with sex. This study suggests that there is a need for interventions to alleviate refractive error in the INK area as well as in other communities affected by the lack of access to affordable services. (Source: Optometry and Vision Science)
Sat, 27 Feb 2016 00:00:00 +0100This report provides the data of the refractive state of the residents consuming drinking water with excess amounts of fluoride in northern China. The refractive errors did not result from ingestion of mild excess amounts of fluoride in the drinking water. PMID: 26920734 [PubMed - as supplied by publisher] (Source: Biological Trace Element Research)
Thu, 25 Feb 2016 18:34:57 +0100Objectives: To evaluate the results of toric intraocular lens (IOL) implantation in patients with cataract and postpenetrating keratoplasty astigmatism. Methods: Seven eyes of 7 patients with cataract and more than 3.5 diopters (D) astigmatism following penetrating keratoplasty were included in this retrospective case series study. All of the eyes underwent phacoemulsification and Acrysof toric IOL (t5–t9) implantation at least 6 months later than the complete suture removal. Corrected visual acuity (CVA), manifest astigmatism, the keratometry measurements, and complications were assessed. Results: The mean preoperative CVA significantly increased (0.7±0.3 [range: 0.3–1.3] logMAR to 0.1±0.04 [range: 0.05–0.15] logMAR; P (Source: Eye and Contact Lens: Science and Clinical Practice...
Thu, 25 Feb 2016 18:34:46 +0100Conclusion: The major predisposing factor for late in-the-bag IOL dislocation is myopia. Despite a complication rate of 43%, mostly minor and transient, IOL exchange surgery is an effective procedure with a good visual outcome (mean 3 Snellen lines improvement). There were no statistically significant differences in the final best-corrected visual acuity or complication rate between anterior chamber IOL and sutured posterior chamber IOL, thus, both surgical techniques may be considered to treat this condition. (Source: RETINA)
Wed, 24 Feb 2016 20:35:13 +0100An advanced optical design for a low-cost and astigmatism-corrected spectrometer with a high resolution is presented. The theory and method of astigmatism correction are determined with the use of a concave toroidal mirror. The performances of a modified spectrometer and a traditional spectrometer ... (Source: Applied Optics)
Wed, 24 Feb 2016 00:00:00 +0100This study consisted of 2156 eyes of 1317 patients with a mean age of 64.92 ± 11.48 (SD) (30–88 years). The mean of AL was 23.33 ± 1.37 mm, and the mean of corneal astigmatism was 1.12 ± 1.10 diopter (D) (range 0.0–7.00), in all patients. Furthermore, the mean of flat and steep keratometry were 43.70 ± 1.70 and 44.83 ± 1.79 D, respectively. Corneal astigmatism was 1.50 D or less in 1590 eyes (73.7 %), more than 1.50 D in 566 eyes (26.2 %), 3.00 D or more in 161 eyes (7.4 %), WTR in 796 eyes (36.9 %), ATR in 1010 eyes (46.8 %), and oblique in 350 eyes (16.2 %). ATR astigmatism axis significantly increased with the increase in age. Corneal astigmatism of most cataract surgery candidates fell between 0.50 and 1.50 D. The results of our study however is confined to o...
Wed, 24 Feb 2016 00:00:00 +0100Abstract The purpose of this study was to report on the occurrence and management of posterior synechiae (PS) in three hyperopic eyes after iris-fixated anterior chamber phakic IOL implantation. This is a case report of a 55-year-old man and a 55-year-old lady who had undergone iris-fixated anterior chamber phakic IOL implantation to correct hyperopic astigmatism (one eye) and hyperopia (both eyes), respectively. The three eyes developed creeping PS and pigment dispersion within 4–6 weeks of surgery. Synechiolysis and pupil stretching in one eye did not work as the synechiae promptly recurred. Definitive management in the form of removal of the phakic implant and phacoemulsification with lens implant was successful in restoring normal vision in all three eyes. Although implanta...
Tue, 23 Feb 2016 00:00:00 +0100Conclusions In this patient cohort oral beta-blocker was well-tolerated. Treatment was therefore often initiated prior to the induction of significant astigmatism, with treatment effects comparable to steroid treatment. Visual outcomes were good. Early treatment may minimize the potential effect of astigmatism on postnatal visual development. (Source: Journal of American Association for Pediatric Ophthalmology and Strabismus)
Mon, 22 Feb 2016 16:36:02 +0100Conclusions: Astigmatism management can have a good outcome in combined procedures. We encourage surgeons to address astigmatism in the preoperative planning of patients undergoing glaucoma surgery associated with phacoemulsification.Case Rep Ophthalmol 2016;7:96-102 (Source: Case Reports in Ophthalmology)
Mon, 22 Feb 2016 16:34:22 +0100ConclusionsThis is the first study to describe the refractive profile of a population of European Caucasian children with ASD compared to a TD population of children. Unlike other neurodevelopmental conditions, there was no increased prevalence of spherical refractive errors in ASD but astigmatic errors were significantly greater in magnitude and prevalence. This highlights the need to examine refractive errors in this population. (Source: Ophthalmic and Physiological Optics)
Mon, 22 Feb 2016 00:00:00 +0100To treat a wide range of ocular diseases, modern-day eye-care practitioners have a growing arsenal of medical contact lenses (CLs). The primary optical indication for fitting a patient with medical CLs is to improve visual acuity in cases of high refractive error and/or irregular astigmatism ; less common indications include anisometropia, nystagmus, and occlusion . In a clinical setting, another important indication for CL use is for therapeutic purposes (e.g., in the case of a corneal bandage, in which the cornea is physically protected from the environment in order to improve hydration, promote corneal healing, and relieve pain) [3–10]. (Source: Contact Lens and Anterior Eye)
Sat, 20 Feb 2016 00:00:00 +0100ConclusionMeasurements show no significant difference from those obtained by the other devices. This suggests the Verion system is en par with instruments used in current clinical practice. The Verion Optical Imaging System produces repeatable data with no difference related to operator experience. (Source: Clinical and Experimental Ophthalmology)
Fri, 19 Feb 2016 05:00:00 +0100We propose a new design for tuning the astigmatism of liquid micro-lenses using electric field and hydrostatic pressure as control parameters. We explore the feasibility and operating range of the lens with a self-consistent numerical calculation of the electric field distribution and the shape of ... (Source: Optics Express)
Thu, 18 Feb 2016 02:42:03 +0100CONCLUSION: We report the prevalence of ptosis (congenital/acquired) in children in Iran and the Middle East region for the first time. Amblyopia was considerably more prevalent in ptotic patients. We found a significant correlation between ptosis and tropia. Astigmatism, especially WTR stigmatism, was more prevalent in children with ptosis. PMID: 26559870 [PubMed - in process] (Source: Strabismus)
Thu, 18 Feb 2016 02:42:03 +0100CONCLUSION: Horizontal rectus muscle surgery tended to induce a transient, statistically significant change in the spherical equivalent of refraction, with a myopic shift that was clinically not important. Our findings did not strongly support that the astigmatism induced changes. There was no correlation between the amount of recession and/or resection and the amount of induced refractive error. PMID: 26559867 [PubMed - in process] (Source: Strabismus)
Thu, 18 Feb 2016 02:42:03 +0100CONCLUSION: Nepalese anisometropic amblyopic children were presented late to hospital. The depth of amblyopia was highly associated with the type and magnitude of refractive error of the amblyopic eye and the magnitude of anisometropia. So, basic vision screening programs may help to find out the anisometropic children and reefer them to the hospital for timely management of anisometropic amblyopia if present. PMID: 24725213 [PubMed - indexed for MEDLINE] (Source: Strabismus)
Thu, 18 Feb 2016 02:42:03 +0100CONCLUSIONS: Children with albinism and children with infantile nystagmus syndrome show larger interocular acuity differences than children with normal vision. Strabismus and nystagmus amplitude are significant predictors of the crowding ratio in the poorer eye. PMID: 24195763 [PubMed - indexed for MEDLINE] (Source: Strabismus)
Wed, 17 Feb 2016 23:34:06 +0100CONCLUSION: Migraine patients may have higher degrees of astigmatism, SE, and anisometropia. Therefore, they should have ophthalmological examinations regularly to ensure that their refractive errors are appropriately corrected. PMID: 25412330 [PubMed - as supplied by publisher] (Source: Seminars in Ophthalmology)
Wed, 17 Feb 2016 23:34:06 +0100Authors: Bozorg S, Pineda R Abstract Patients with both cataract and keratoconus present unique challenges for the surgeon. Accurate keratometry (K) and axial length (AL) readings may be impossible, and uncertainty is introduced when estimating the corneal power for intraocular lens (IOL) selection. Different options on how to choose an IOL and how to manage irregular astigmatism of a keratoconic patient with cataract have been proposed and are reviewed. The stage of keratoconus and the history of the patient are both critical in determining the strategy used in treatment of cataracts. PMID: 25325863 [PubMed - indexed for MEDLINE] (Source: Seminars in Ophthalmology)
Mon, 15 Feb 2016 00:00:00 +0100A 12-month-old male infant, noted from birth to have a diffuse right temporal epibulbar thickening that encroached on the limbus inferotemporally, was found to manifest stigmata of Goldenhar syndrome (GS), including a limbal dermoid with vellus hairs, esotropia, astigmatism, fullness and ectropion of the lower eyelid, pre-auricular skin tag, agenesis of the right kidney and a supernumerary rib. In the excised epibulbar specimen, in addition to a solid dermoid, lobules of lacrimal gland tissue were interpreted as a portion of the palpebral and/or orbital lobes. (Source: Survey of Ophthalmology)
Sun, 14 Feb 2016 15:20:02 +0100CONCLUSIONS: HOA, particularly coma HOA, correlated with astigmatism and could exert effects in cases involving hyperopic amblyopia. PMID: 26865804 [PubMed - in process] (Source: Korean Journal of Ophthalmology : KJO)
Thu, 11 Feb 2016 00:00:00 +0100CONCLUSIONS: In association with pterygium excision, conjunctival autograft is associated with a lower risk of recurrence at six months' after surgery than amniotic membrane transplant. Participants with recurrent pterygia in particular have a lower risk of recurrence when they receive conjunctival autograft surgery compared with amniotic membrane transplant. There are few studies comparing the two techniques with respect to visual acuity outcomes, and we identified no studies that reported on vision-related quality of life or direct or indirect costs. Comparison of these two procedures in such outcome measures bears further investigation. There were an insufficient number of studies that used adjunctive mitomycin C to estimate the effects on pterygium recurrence following conjunctival aut...
Fri, 05 Feb 2016 16:04:47 +0100Conclusions: Larger lengths and increased vascularity were associated with larger PIA. PIA can be predicted by evaluating the length and vascularity of pterygium involving the cornea. (Source: Cornea)
Fri, 05 Feb 2016 16:04:46 +0100Conclusions: There is no significant difference in the refractive and visual outcomes after femtosecond laser–assisted penetrating keratoplasty compared with GTS keratoplasty. The benefits from the use of the femtosecond laser may be limited and should be weighed against an increased risk of immune reactions, higher surgical complexity, and higher costs. (Source: Cornea)
Fri, 05 Feb 2016 16:04:46 +0100Conclusions: In eyes with endothelial decompensation secondary to DM breaks caused at birth by forceps injury, DSAEK can be performed uneventfully and restore cornea clarity. However, visual recovery is limited by the preexistent amblyopia, usually resulting from anisometropia and/or high-degree unilateral astigmatism. The results obtained in our patients suggest that low-degree astigmatism may be associated with better visual outcomes. (Source: Cornea)
Tue, 02 Feb 2016 20:09:26 +0100The Food & Drug Administration today released a list of pre-market approvals granted in December 2015: Summary of PMA Originals & Supplements Approved Originals: 2 Supplements: 81 Summary of PMA Originals Under Review Total Under Review: 58 Total Active: 32 Total On Hold: 26 Summary of PMA Supplements Under Review Total Under Review: 599 Total Active: 423 Total On Hold: 176 Summary of All PMA Submissions Originals: 3 Supplements: 92 Summary of PMA Supplement PMA Approval/Denial Decision Times Number of Approvals: 81 Number of Denials: 0 Average Days Fr Receipt to Decision (Total Time): 163.1 FDA Time: 140.4 Days MFR Time: 22.7 Days PMA Original Approvals APPLICATION NUMBER / DATE of APPROVAL DEVICE TRADE NAME COMPANY NAME CITY, STATE, & ZIP DEVICE DESCRIPTION / IN...
Tue, 02 Feb 2016 13:36:02 +0100ABSTRACT Alport Syndrome is a hereditary disease that is caused by a gene mutation and affects the production of collagen in basement membranes; this condition causes hemorrhagic nephritis associated with deafness and ocular changes. The X-linked form of this disease is the most common and mainly affects males. Typical ocular findings are dot-and-fleck retinopathy, anterior lenticonus, and posterior polymorphous corneal dystrophy. Some cases involving polymorphous corneal dystrophy and corneal ectasia have been previously described. Here we present a case report of a 33-year-old female with Alport syndrome, posterior polymorphous corneal dystrophy, and irregular astigmatism, whose visual acuity improved with a rigid gas permeable contact lens.RESUMO A síndrome de Alport é descrita como u...
Mon, 01 Feb 2016 06:00:00 +0100This study compares the 3-month results of myopia and compound myopic astigmatism correction by tPRK or conventional alcohol-assisted PRK (aaPRK). This prospective, nonrandomized, case–control study recruited 148 consecutive patients; 93 underwent tPRK (173 eyes) and 55 aaPRK (103 eyes). Refractive results, predictability, safety, and efficacy were evaluated during the 3-month follow-up. The main outcome measures were uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), and mean refractive spherical equivalent (MRSE). Mean preoperative MRSE was −4.30 ± 1.72 D and −4.33 ± 1.96 D, respectively (P = 0.87). The 3-month follow-up rate was 82.1% in the tPRK group (n = 145) and 86.4% in aaPRK group (n = 90), P = 0.81. Postoperative ...
Mon, 01 Feb 2016 00:00:00 +0100Periocular infantile hemangiomas (PIH) can induce anisometropic astigmatism, a risk factor for amblyopia. Oral beta-blocker therapy has largely supplanted systemic or intralesional corticosteroids. The purpose of this study was to evaluate the effect and time course of these treatment modalities on visual acuity and induced astigmatism. (Source: Journal of AAPOS)
Thu, 28 Jan 2016 22:34:48 +0100Conclusions: ORF is significantly reduced in students with bilateral astigmatism (≥1.00D) when uncorrected but not when best-corrected compared with their nonastigmatic peers. Improvement in ORF with spectacle correction is seen in high astigmats but not in moderate astigmats. These data support the recommendation for full-time spectacle wear in astigmatic students, particularly those with high astigmatism. (Source: Optometry and Vision Science)
Fri, 22 Jan 2016 08:00:00 +0100Authors: O Collier Wakefield, R Annoh & M A Nanavaty (Source: Eye)
Thu, 21 Jan 2016 00:00:00 +0100Abstract Traditionally when determining a patient’s astigmatism, only the curvature of the anterior cornea was measured. This was due to the relative ease of anterior measurement and assumptions that the posterior cornea did not play a significant role in refraction. However, new technologies have been developed to measure the posterior corneal curvature, and outcome data have shown that including the posterior curvature in toric IOL power calculations reduces residual astigmatic error. Understanding the contribution of the posterior cornea to a patient’s astigmatism is a key in order to provide the best care and refractive outcomes. (Source: Current Ophthalmology Reports)
Thu, 21 Jan 2016 00:00:00 +0100Conclusions Both toric IOL implantation and LRI were effective in correcting corneal astigmatism ≤3 D during phacoemulsification, while LRI tended to undercorrect astigmatism. (Source: British Journal of Ophthalmology)
Thu, 21 Jan 2016 00:00:00 +0100Conclusions Long AXL is a risk factor for toric IOL rotation, while higher ACO grade may decrease toric IOL rotation, indicating that reducing the polishing of anterior capsule may improve the rotational stability of a toric IOL. Trial registration number NCT02182921. (Source: British Journal of Ophthalmology)
Sat, 16 Jan 2016 00:00:00 +0100Abstract The purpose of this study was to evaluate the early visual and refractive outcomes of a new aspheric monofocal microincision intraocular lens (IOL). This retrospective case series included eyes of patients who underwent implantation of a microincision IOL following 1.8 mm manual coaxial microincision cataract surgery and who attended regular postoperative follow-up visits on the first week and first, third, and sixth months. The postoperative uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refraction and predictability, intraoperative and postoperative complications, posterior capsule opacification (PCO), IOL centration, and surgically induced astigmatism (SIA) were evaluated. Sixty-three eyes of 38 patients ranging in age from 51 to 86 were inclu...
Wed, 13 Jan 2016 01:00:03 +0100CONCLUSION: Although photorefraction was accurate for measurement of myopia and astigmatism, its sensitivity for hyperopia was low which could be improved by considering revised cut-off points. Considering cut-off points, photorefraction can be used as a screening method. PMID: 26730305 [PubMed] (Source: Journal of Ophthalmic and Vision Research)
Tue, 12 Jan 2016 22:46:00 +0100Conclusions: DALK is an alternative surgical procedure for corneal stromal pathologies without endothelial abnormalities, with lower efficacy but better safety. (Source: Cornea)
Tue, 12 Jan 2016 22:46:00 +0100Conclusions: Both FS-LASIK and SMILE procedures achieved good visual outcomes in the correction of myopia and myopic astigmatism. SMILE had a lower induction rate of spherical aberration at 6 months postoperatively in the analysis of 6 mm diameter than that of FS-LASIK. (Source: Cornea)
Tue, 12 Jan 2016 22:46:00 +0100Conclusions: The differences in steep K, and especially in astigmatism values, between eyes tended to reduce during the period of action of BTX-A. At 4 months, when the BTX-A effect is considered to be over or very reduced, a significant difference between eyes for both parameters was noted again. (Source: Cornea)
Mon, 11 Jan 2016 00:00:00 +0100Conclusions The Ks, Kf and Km obtained by Topcon KR-1W and iTrace showed excellent intraobserver repeatability and interobserver and intersession reproducibility in normal eyes. The agreement between Topcon KR-1W and Topolyzer, Topcon KR-1W and IOLMaster, iTrace and Topolyzer, iTrace and IOLMaster, Topcon KR-1W and iTrace were not so good, they should not be interchangeable in clinical application. Given that the intraobserver repeatability and interobserver and intersession reproducibility of corneal astigmatism measurements obtained by Topcon KR-1W and iTrace were poor, it should be cautious that Topcon KR-1W and iTrace were applied for the preparation of toric lens implantation. (Source: PLoS One)
Fri, 08 Jan 2016 00:00:00 +0100CONCLUSIONS: This first long-term study demonstrates SMILE to be an effective, stable and safe procedure for treatment of myopia and myopic astigmatism. CLINICAL TRIAL NUMBER: DE/CA93/KP/07/001. Post-results. PMID: 26746577 [PubMed - as supplied by publisher] (Source: The British Journal of Ophthalmology)
Fri, 01 Jan 2016 00:00:00 +0100CONCLUSIONS: In our patient population, children with isolated metopic craniosynostosis demonstrate an increased rate of amblyopia and its risk factors. Amblyopia is best treated early in life to achieve a successful outcome. A referral to a pediatric ophthalmologist for a formal eye exam and potential treatment is therefore recommended for children with isolated metopic craniosynostosis. PMID: 26720640 [PubMed - in process] (Source: The Cleft Palate-Craniofacial Journal)
Fri, 01 Jan 2016 00:00:00 +0100To evaluate the safety and effectiveness of topography-guided custom ablation treatment (T-CAT) to correct myopia and myopic astigmatism with laser in situ keratomileusis (LASIK). (Source: Journal of Cataract and Refractive Surgery)
Fri, 01 Jan 2016 00:00:00 +0100To evaluate the influence factors of the estimation errors for total corneal astigmatism using keratometric astigmatism in patients preparing for cataract surgery. (Source: Journal of Cataract and Refractive Surgery)
Mon, 28 Dec 2015 19:31:22 +0100Objective: The purpose of the study was to evaluate the efficacy of orthokeratology in correcting myopia. Methods: The study took place over three ophthalmology practices, which were trained in fitting corneal reshaping therapy lenses. The patients' age ranged from 9 to 59 years. The patients were split into 5 groups: 9 to 13, 14 to 21, 22 to 37, 38 to 42, 43 to 48, and 49 to 59 years. There were a total of 260 eyes being tested and the manifest refraction ranged from −0.25 diopters (D) to −7.75 D with astigmatism up to 1.50 D. Patients were fit using a calculator slide rule program and also by a diagnostic lens set. Results: The patient's uncorrected visual acuity (UCVA) was improved with 99% achieving visual acuities better than 20/40 and 85% achieved 20/20. There were no significant...
Mon, 21 Dec 2015 00:00:00 +0100Any trauma can trigger a cascade of responses in tissues, with the purpose of safeguarding the integrity of the organ affected by the trauma and of preventing possible damage to nearby organs. Subsequently, the body tries to restore the function of the organ affected. The introduction of the excimer laser for keratorefractive surgery has changed the treatment landscape for correcting refractive errors, such as myopia, hyperopia, and astigmatism. In recent years, with the increased understanding of the basic science of refractive errors, higher-order aberrations, biomechanics, and the biology of corneal wound healing, a reduction in the surgical complications of keratorefractive surgery has been achieved. The understanding of the cascade of events involved in the corneal wound healing proce...
Mon, 21 Dec 2015 00:00:00 +0100Corneal ectasias include a group of disorders characterised by progressive thinning, bulging and distortion of the cornea. Keratoconus is the most common disease in this group. Other manifestations include pellucid marginal degeneration, Terrien's marginal degeneration, keratoglobus and ectasias following surgery. Advanced ectasias usually present with loss of vision due to high irregular astigmatism. Management of these disorders is difficult due to the peripheral location of ectasia and associated severe corneal thinning. Newer contact lenses such as scleral lenses are helpful in a selected group of patients. A majority of these cases requires surgical intervention. This review provides an update on the current treatment modalities available for management of advanced corneal ectasias. (...
Mon, 21 Dec 2015 00:00:00 +0100ConclusionsMiniscleral contact lenses that vault the cornea induce significant changes in anterior corneal surface topography and higher order aberrations following 8 h of lens wear. The region of greatest corneal flattening was observed in the superior‐nasal mid‐periphery, more so in East Asian participants. Practitioners should be aware that corneal measurements obtained following miniscleral lens removal may mask underlying corneal steepening. (Source: Ophthalmic and Physiological Optics)
Sun, 20 Dec 2015 21:10:21 +0100Authors: Pron G, Ieraci L, Kaulback K, Medical Advisory Secretariat, Health Quality Ontario Abstract OBJECTIVE: The main objectives for this evidence-based analysis were to determine the safety and effectiveness of photochemical corneal collagen cross-linking with riboflavin (vitamin B(2)) and ultraviolet-A radiation, referred to as CXL, for the management of corneal thinning disease conditions. The comparative safety and effectiveness of corneal cross-linking with other minimally invasive treatments such as intrastromal corneal rings was also reviewed. The Medical Advisory Secretariat (MAS) evidence-based analysis was performed to support public financing decisions. SUBJECT OF THE EVIDENCE-BASED ANALYSIS: The primary treatment objective for corneal cross-linking is to increase the...
Sun, 20 Dec 2015 21:05:20 +0100CONCLUSION: The present report showed the pattern of corneal astigmatism before cataract surgery in Thai governmental hospital, approximately one third of cataract patients had more than 1.00 D of astigmatism. This finding provide the important normative reference and help ophthalmologists to plan and manage the cost-effective correction of preexisting corneal astigmatism in cataract patients to achieve the best visual outcome. PMID: 26591398 [PubMed - indexed for MEDLINE] (Source: Journal of the Medical Association of Thailand = Chotmaihet thangphaet)
Fri, 18 Dec 2015 19:57:18 +0100This correspondence concerns the results of a clinical trial for the United States Food and Drug Administration device exemption registration for the Tecnis toric intraocular lens.1 The goals of cataract surgery are varied,2 but are predominantly to provide best possible visual acuity targeted nowadays to aim for spectacle independence and this article gives us more evidence to support our choices. (Source: Ophthalmology)
Thu, 17 Dec 2015 05:00:00 +0100The feasibility of an off-axis x-ray reflection zone plate to perform wavelength-dispersive spectroscopy, on-axis point focusing, and two-dimensional imaging is demonstrated by means of one and the same diffractive optical element (DOE) at a synchrotron radiation facility. The resolving power ... (Source: Optics Letters)
Sun, 13 Dec 2015 00:00:00 +0100We present the first documented case of a 78-year-old woman who presented with diplopia as a result of exacerbation of a preexisting torsion following toric lens implantation. (Source: Journal of American Association for Pediatric Ophthalmology and Strabismus)
Thu, 10 Dec 2015 00:00:00 +0100Conclusion: Single preoperative administration of subconjunctival injection bevacizumab given 1 week before the pterygium excision with conjunctival autograft decreases the vascularity of newly formed blood vessels, hence may decrease recurrence rate though not in our study. (Source: Indian Journal of Ophthalmology)
Wed, 09 Dec 2015 19:34:41 +0100Conclusions: WTW distance should always be measured preoperatively when planning cataract surgery and should be accounted for in cases of large and small corneas. (Source: Cornea)
Wed, 09 Dec 2015 19:34:33 +0100Conclusions: This is the largest case series of TG-PRK to treat irregular astigmatism in postcorneal transplantation eyes. Our results confirm that TG-PRK is an efficient treatment, associated with significant improvements of both visual acuity and refractive parameters. (Source: Cornea)
Wed, 09 Dec 2015 00:00:00 +0100Conclusions Changes in corneal morphology observed in this study could be useful in borderline situations to confirm the diagnosis of pure microphthalmia. (Source: Journal of International Medical Research)
Tue, 08 Dec 2015 00:00:00 +0100Abstract The aim of this study is to determine and compare biometric and refractive characteristics of thalassemia major patients and normal individuals. In this cross-sectional study, 54 thalassemia major patients were selected randomly as case group, and 54 age- and sex-matched healthy subjects were regarded as control group. Refractive errors, corneal curvature and ocular components were measured by autokeratorefractometery and A-scan ultrasonography, respectively. Mean spherical equivalent was −0.0093 ± 0.86 D in thalassemia patients and −0.22 ± 1.33 D in the normal group. The prevalence of myopia, Hyperopia, and emmetropia among thalassemia patients was 16.7, 19.4, and 63.9 %, respectively. While in the control group, 26.9 % were myopic, 25 % were hyperopic, an...
Sat, 05 Dec 2015 05:44:49 +0100This article raises awareness about the cost–effectiveness and carbon footprint of various cataract surgery techniques, comparing their relative carbon emissions and expenses: manual small-incision cataract surgery (MSICS), phacoemulsification, and femtosecond laser-assisted cataract surgery. Recent findings: As the most commonly performed surgical procedure worldwide, cataract surgery contributes significantly to global climate change. The carbon footprint of a single phacoemulsification cataract surgery is estimated to be comparable to that of a typical person's life for 1 week. Phacoemulsification has been estimated to be between 1.4 and 4.7 times more expensive than MSICS; however, given the lower degree of postoperative astigmatism and other potential complications, phacoemulsificat...
Sat, 05 Dec 2015 05:44:47 +0100This article reviews current concepts in intraocular lens alignment strategies to maximize intraocular lens (IOL) positioning. Recent findings: A variety of strategies has been developed to maximize toric IOL position, including preoperative calculators to determine the appropriate IOL power and orientation, intraoperative alignment devices, and postoperative software to determine if IOL rotation would be beneficial for refractive outcomes. Summary: The combination of using multiple toric IOL calculators and intraoperative alignment devices has improved toric IOL outcomes. The relationship of the posterior corneal power and its effect on outcomes remains to be fully elucidated. Postoperative IOL rotation may be necessary even when the IOL is aligned as planned because of surgically induced...
Sat, 05 Dec 2015 05:44:46 +0100Purpose of review: The purpose of the present study is a systematic review of previous studies on choosing the best incision site for the correction of astigmatism in cataract surgery and assessing the amount of surgically induced astigmatism (SIA) with each approach. Recent findings: Regardless of astigmatism axis, studies show that using an on-axis incision is associated with favorable results for 0.5–1.0 diopter (D) of astigmatism. In cases with more than 1.0 D astigmatism, paired on-axis incisions can be appreciably efficient in astigmatism correction and cause at least 1.5 D SIA. Considering the amount of SIA, a temporal incision is the best approach when the patient has minimal amounts of corneal astigmatism preoperatively. At higher levels of astigmatism, if no other astigmati...
Fri, 04 Dec 2015 18:10:18 +0100The FDA today released its list of the pre-market approvals it granted for medical devices in October 2015: Summary of PMA Originals & Supplements Approved Originals: 9 Supplements: 133 Summary of PMA Originals Under Review Total Under Review: 58 Total Active: 32 Total On Hold: 26 Summary of PMA Supplements Under Review Total Under Review: 597 Total Active: 433 Total On Hold: 164 Summary of All PMA Submissions Originals: 7 Supplements: 74 Summary of PMA Supplement PMA Approval/Denial Decision Times Number of Approvals: 133 Number of Denials: 0 Average Days Fr Receipt to Decision (Total Time): 161.5 FDA Time: 97.9 Days MFR Time: 63.6 Days PMA Original Approvals APPLICATION NUMBER / DATE of APPROVAL DEVICE TRADE NAME COMPANY NAME CITY, STATE, & ZIP DEVICE DESCRIPTION /...
Thu, 03 Dec 2015 05:00:00 +0100We propose a bar-type three-dimensional holographic head mounted display using two holographic optical elements. Conventional stereoscopic head mounted displays may suffer from eye fatigue because the images presented to each eye are two-dimensional ones, which causes mismatch between the ... (Source: Optics Express)
Thu, 03 Dec 2015 00:00:00 +0100ConclusionMeasurements show no significant difference from those obtained by the other devices. This suggests the Verion system is en par with instruments used in current clinical practice. The Verion Optical Imaging System produces repeatable data with no difference related to operator experience. This article is protected by copyright. All rights reserved. (Source: Clinical and Experimental Ophthalmology)
Wed, 02 Dec 2015 04:34:15 +0100CONCLUSION: The AcrySof IQ Toric SN6AT2 IOL is a safe and effective option for eyes undergoing cataract surgery with low levels of preoperative corneal astigmatism. PMID: 25667733 [PubMed] (Source: Journal of Ophthalmic and Vision Research)
Wed, 02 Dec 2015 04:34:15 +0100CONCLUSION: Single-segment implantation of conventional and SK Intacs improved UCDVA and BSCVA, decreased corneal AST and keratometry in both groups with comparable outcomes. PMID: 25667729 [PubMed] (Source: Journal of Ophthalmic and Vision Research)
Wed, 02 Dec 2015 04:34:15 +0100CONCLUSION: More than half of high school students in Aligoudarz had at least one type of refractive error. Compared to similar studies, the prevalence of refractive errors was high in this age group. PMID: 25279126 [PubMed] (Source: Journal of Ophthalmic and Vision Research)
Tue, 01 Dec 2015 00:00:00 +0100We present the first documented case of a 78-year-old woman who presented with diplopia as a result of exacerbation of a preexisting torsion following toric lens implantation. (Source: Journal of AAPOS)
Tue, 01 Dec 2015 00:00:00 +0100This patient has a symmetric bow-tie pattern WTR astigmatism. High degrees of astigmatism can be treated with LASIK using iris registration and wavefront, but I would not consider LASIK for this patient. Even with femtosecond lasers and thin, predictable flaps, the predicted RSB and PTA are outside my comfort zone. (Source: Journal of Cataract and Refractive Surgery)
Tue, 01 Dec 2015 00:00:00 +0100This is a very interesting case of high regular astigmatism in normal but relatively thin corneas. We would recommend a surface ablation, such as PRK or small-incision lenticule extraction, or treatment with further preoperative work-up and pIOL implantation. (Source: Journal of Cataract and Refractive Surgery)
Tue, 01 Dec 2015 00:00:00 +0100This case presents a young woman with symmetric myopic astigmatism and without parameters of keratoconus suspect obtained with Scheimpflug devices. For refractive treatment, I would not consider LASIK (with a predictable thin flap) for 2 reasons. One is that the calculated RSB is less than 300 μm in both eyes and the cutoff value used in the ectasia risk score system1 (ERSS) is at least 300 μm. Applying the score system, 5 points are obtained, showing a high risk for ectasia. (Source: Journal of Cataract and Refractive Surgery)
Tue, 01 Dec 2015 00:00:00 +0100This 21-year-old potential refractive candidate has steep corneas and high regular symmetric astigmatism that has been stable over 1 year. Her keratometric values also were stable over the follow-up period. Her pachymetry is 505 μm in the right eye and 508 μm in the left eye. She has no family history of keratoconus or other relevant medical history. (Source: Journal of Cataract and Refractive Surgery)
Tue, 01 Dec 2015 00:00:00 +0100Although it is not common, isolated anterior corneal curvature above 48.0 D is no longer a hallmark of ectasia. In this case, the topographic distribution along the whole surface leads to a congenital astigmatism diagnosis. A CCT measurement would suffice not to contraindicate the refractive procedure, and thickness maps are reassuring but not mandatory. Aside from an absence of ectatic disorders, which are a major cause of postoperative ectasia, thin corneas might pose a problem regarding the RSB. (Source: Journal of Cataract and Refractive Surgery)
Tue, 01 Dec 2015 00:00:00 +0100A 21-year-old woman with moderately high myopia and high astigmatism is interested in refractive surgery. I am assuming she was out of her contact lenses for all of her evaluations and her refractions have been stable for several years. Of critical importance are that her corneal topographies and tomographies reveal stable, regular, with-the-rule (WTR) astigmatism with no posterior corneal elevation over the past year, and her corneal thicknesses are reasonably normal with a normal distribution pattern. (Source: Journal of Cataract and Refractive Surgery)
Tue, 01 Dec 2015 00:00:00 +0100A 21-year-old woman was referred for a refractive surgery evaluation. She has no relevant allergies or medical or family history of keratoconus or corneal transplantation. Spectacle dependence is her chief complaint. She occasionally wears contact lenses but wants to have surgery performed. The corrected near visual acuity and the corrected distance visual acuity (CDVA) are 20/20 in both eyes. The manifest refraction is −5.75 −3.25 × 178 in the right eye and −5.00 −3.50 × 170 in the left eye. The intraocular pressure and the results from a slitlamp examination and a fundus retinoscopy are normal. (Source: Journal of Cataract and Refractive Surgery)
Tue, 01 Dec 2015 00:00:00 +0100To evaluate vector analysis, rotational stability, and visual outcomes after implantation of toric IOLs with low ( (Source: Journal of Cataract and Refractive Surgery)
Tue, 01 Dec 2015 00:00:00 +0100To evaluate the changes in corneal higher-order aberrations (HOAs) and their impact on corneal higher-order Strehl ratio after aberration-free ablation profile. (Source: Journal of Cataract and Refractive Surgery)
Sat, 28 Nov 2015 12:51:34 +0100CONCLUSION: The Moria One Use-Plus SBK microkeratome is an excellent device that allows the easy creation of thin corneal flaps and regular and smooth corneal beds, safely and predictably even in extremely flat corneas without complications. The safety, efficacy and predictability are quite comparable to the general LASIK group. PMID: 26549141 [PubMed - as supplied by publisher] (Source: Journal Francais d Ophtalmologie)
Sat, 28 Nov 2015 12:51:34 +0100CONCLUSIONS: Infants with low gestational age and low birth weight also had low spherical equivalent. Moreover, spherical equivalent correlated with increasing postmenstrual age. However, astigmatism did not correlate with postmenstrual age and did not associate with gestational age or birth weight. PMID: 26542677 [PubMed - as supplied by publisher] (Source: Journal Francais d Ophtalmologie)
Thu, 26 Nov 2015 00:00:00 +0100Conclusions SMILE performed well in the correction of myopia and myopic astigmatism, and no significant change in endothelial cell density or any other serious complications occurred throughout the 1-year follow-up period, suggesting its viability as a surgical option for the treatment of such eyes. (Source: BMJ Open)
Wed, 25 Nov 2015 00:00:00 +0100CONCLUSION: Thickness and volume parameters measured by the Pentacam Scheimflug system effectively discriminate subclinical keratoconus corneas from normal corneas. PMID: 26605668 [PubMed - as supplied by publisher] (Source: Current Eye Research)
Sat, 21 Nov 2015 16:42:47 +0100PRESBYOPIA OPTOMETRY METHOD BASED ON DIOPTER REGULATION AND CHARGE COUPLE DEVICE IMAGING TECHNOLOGY. J Biol Regul Homeost Agents. 2015 Jul-Sep;29(3):521-6 Authors: Zhao Q, Wu XX, Zhou J, Wang X, Liu RF, Gao J Abstract With the development of photoelectric technology and single-chip microcomputer technology, objective optometry, also known as automatic optometry, is becoming precise. This paper proposed a presbyopia optometry method based on diopter regulation and Charge Couple Device (CCD) imaging technology and, in the meantime, designed a light path that could measure the system. This method projects a test figure to the eye ground and then the reflected image from the eye ground is detected by CCD. The image is then automatically identified by computer and the far p...
Wed, 18 Nov 2015 23:49:53 +0100Conclusion: Our results indicate that measurements of anterior segment using the Pentacam® yield highly reproducible results in a normal population without major pathologies of the anterior eye segment. PMID: 26575536 [PubMed - as supplied by publisher] (Source: Klinische Monatsblatter fur Augenheilkunde)
Wed, 18 Nov 2015 00:00:00 +0100We performed a systematic review and meta-analysis to evaluate the benefit and harms associated with implantation of toric intraocular lenses (IOLs) during cataract surgery. Outcomes were postoperative uncorrected distance visual acuity (UCDVA) and distance spectacle independence. Harms were evaluated as surgical complications and residual astigmatism. (Source: Ophthalmology)
Tue, 10 Nov 2015 00:00:00 +0100CONCLUSIONS: Corneal biomechanical parameters measured preoperatively with Corvis ST showed significant differences postoperatively in total and in both groups. In subgroup analysis with homogenous groups, FS-LASIK showed no significant changes in biomechanical data measured with Corvis ST compared with SMILE. PMID: 26554611 [PubMed - as supplied by publisher] (Source: Current Eye Research)
Sat, 07 Nov 2015 20:36:50 +0100Conclusions: This combined procedure was effective and safe for the treatment of high-level or mixed astigmatism. (Source: Cornea)
Thu, 05 Nov 2015 00:00:00 +0100CONCLUSIONS: Implantation of the Torica-aA IOL was safe and effective in reducing low to moderate preexisting corneal astigmatism and provided good rotational stability and refractive outcomes, which led to a high degree of patient satisfaction. PMID: 26541110 [PubMed - as supplied by publisher] (Source: European Journal of Ophthalmology)
Thu, 05 Nov 2015 00:00:00 +0100CONCLUSIONS: The results suggest that treatment with BTX-A in patients with HFS leads to eyelid and corneal changes on the affected eye that are significant during the known period of action of the toxin. Thus, caution should be taken when performing ophthalmological examination in patients with HFS, since it may vary according to BTX-A period of action. PMID: 26541432 [PubMed - as supplied by publisher] (Source: The British Journal of Ophthalmology)