Astigmatism Research Today is a free monthly online journal that collates and summarizes the latest research about Astigmatism, including details on cornea, retina, treatment, types, signs, tests.

Characteristics of Straylight in Normal Young Myopic Eyes and Changes before and after LASIK.

Li J, Wang Y

Tianjin Eye Hospital and Eye Institute, Tianjin Medical University, Tianjin, China.

Purpose. To investigate the characteristics of straylight and relevant factors in normal young myopic eyes and to assess changes in straylight and possible influencing factors before and after laser in situ keratomileusis (LASIK). Methods. In this prospective nonrandomized study, 105 eyes of 105 patients were included. The level of straylight was measured with a straylight meter, and relationships with some optic parameters were analyzed in normal young myopic eyes. The difference between postoperative and preoperative straylight and the relationship with ablation were studied before and 1, 4, and 10 months after LASIK surgery. Results. For normal eyes, sphere, astigmatism, keratometric (K) value, corneal central thickness (CCT), and anterior chamber depth (ACD) showed no significant correlation with straylight. However, straylight values showed a statistically significant increase 1 and 4 months after surgery (P < 0.05) but returned to preoperative levels at 10 months after surgery (P > 0.05) in LASIK eyes. No statistically significant relationship was found between straylight values and ablation depth, ablation ratio, residual bed thickness (RBT), or RBT/CCT (P > 0.05) after surgery. Conclusions. Specific optic parameters (refractive power, K value, CCT, and ACD) have no significant correlation with straylight. Although straylight increased during the early postoperative period, the parameter returned to preoperative levels over time.

Published 11 May 2011 in Invest Ophthalmol Vis Sci, 52(6): 3069-73.
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Articles on Astigmatism published 10 May 2011:

Bioptics in sutureless intrascleral multifocal posterior chamber intraocular lens fixation.   J Refract Surg, 27(5): 386-8.

[Abstract] [Full-text]

Management of Corneal Ectasia After LASIK with Combined, Same-Day, Topography-Guided Partial Transepithelial PRK and Collagen Cross-Linking: The Athens Protocol.   J Refract Surg, 27(5): 323-31.

[Abstract] [Full-text]

New axis-marking method for a toric intraocular lens: mapping method.   J Refract Surg, 27(5): 375-9.

[Abstract] [Full-text]

Limbal relaxing incisions using a reference point and corneal topography for intraoperative identification of the steepest meridian.   J Refract Surg, 27(5): 339-44.

[Abstract] [Full-text]

Articles on Astigmatism published 4 May 2011:

Stage-related therapy of corneal dystrophies.   Dev Ophthalmol, 48: 116-53.

Corneal dystrophies typically result in a gradual bilateral loss of vision in a primary 'white eye' - often in conjunction with epithelial defects in later stages. Treatment of corneal dystrophies needs to be stage-related. To ensure a stage-related therapeutic approach, an adequate classification based on clinical, histopathological and genetic knowledge is indispensable. In principle, topical medications, contact lenses and various microsurgical approaches are applicable. In case of ... [Abstract] [Full-text]

The effect of instrument alignment on peripheral refraction measurements by automated optometer.   Ophthalmic Physiol Opt.

Citation information: Ehsaei A, Chisholm CM, Mallen EAH & Pacey IE. The effect of instrument alignment on peripheral refraction measurements by automated optometer. Ophthalmic Physiol Opt 2011. doi: 10.1111/j.1475-1313.2011.00838.x ABSTRACT: Purpose:  Interest in peripheral refraction measurement has grown in recent years in response to the insight it may provide into myopia development. In light of the likely increase in the clinical use of open-field autorefractors for peripheral ... [Abstract] [Full-text]

Articles on Astigmatism published 2 May 2011:

Prevalence and Risk Factors for Visual Impairment in Preschool Children The Sydney Paediatric Eye Disease Study.   Ophthalmology.

PURPOSE: To assess the prevalence and associations of visual impairment (VI) in preschool children. DESIGN: Cross-sectional, population-based study. PARTICIPANTS: A total of 2461 children (73.8% participation rate), aged 6 to 72 months, were examined in the Sydney Paediatric Eye Disease Study during 2007-2009; of whom 1188, aged 30 to 72 months, with complete visual acuity (VA) data in both eyes, were included in this report. METHODS: Measurement of VA was attempted on all children using the ... [Abstract] [Full-text]

23- and 20-Gauge Vitrectomy with Air Tamponade with Combined Phacoemulsification for Idiopathic Macular Hole: A Single-Surgeon Study.   Am J Ophthalmol.

PURPOSE: To compare the results of 23- and 20-gauge vitrectomies combined with phacoemulsification and aspiration and intraocular lens implantation (phacoemulsification surgery) 1 year after repair of idiopathic macular holes. DESIGN: Retrospective, consecutive, comparative case series. METHODS: The medical charts of 100 consecutive eyes were reviewed that had undergone either 23- or 20-gauge vitrectomy combined with phacoemulsification surgery to treat an idiopathic macular hole performed by 1 ... [Abstract] [Full-text]

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