On testing astigmatism
نویسندگان
چکیده
منابع مشابه
Effects of lamellar keratotomy on postkeratoplasty astigmatism.
AIM To determine the changes in postkeratoplasty astigmatism induced by lamellar keratotomy. METHODS A prospective, non-randomised comparative trial of patients undergoing a hinged lamellar corneal flap for treatment of significant astigmatism after penetrating keratoplasty. Uncorrected visual acuity, best corrected visual acuity, refraction, and corneal topography were assessed at 1 and 3 mo...
متن کاملEffects of chalazia on corneal astigmatism
BACKGROUND A chalazion is a common eyelid disease that causes eye morbidity due to inflammation and cosmetic disfigurement. Corneal topographic changes are important factors in corneal refractive surgery, intraocular lens power calculations for cataract surgery, and visual acuity assessments. However, the effects of chalazia on corneal astigmatism have not been thoroughly investigated. The chan...
متن کاملLASIK for Spherical Refractive Myopia: Effect of Topographic Astigmatism (Ocular Residual Astigmatism, ORA) on Refractive Outcome
PURPOSE In eyes with a preoperative plano refractive cylinder, it would appear that there is no rationale for astigmatic treatment. The aim of this retrospective, cross-sectional data analysis was to determine the amount of topographic astigmatism in refractive plano eyes that results in reduced efficacy after myopic laser in situ keratomileusis (LASIK). METHODS This study included 267 eyes f...
متن کاملInfluence of posterior corneal astigmatism on postoperative refractive astigmatism in pseudophakic eyes after cataract surgery
BACKGROUND To examine the influence of posterior corneal astigmatism on postoperative refractive astigmatism in pseudophakic eyes after cataract surgery. METHODS The study enrolled 64 pseudophakic eyes of 50 patients (71.8 ± 9.9 years old, mean ± standard deviation) who had undergone phacoemulsification with non-toric IOL implantation. Refractive astigmatism was measured using an auto ref-ker...
متن کاملContribution of posterior corneal astigmatism to total corneal astigmatism.
PURPOSE To determine the contribution of posterior corneal astigmatism to total corneal astigmatism and the error in estimating total corneal astigmatism from anterior corneal measurements only using a dual-Scheimpflug analyzer. SETTING Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA. DESIGN Case series. METHODS Total corneal astigmatism was calculated using ray trac...
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ژورنال
عنوان ژورنال: Transactions of the Optical Society
سال: 1915
ISSN: 1475-4878
DOI: 10.1088/1475-4878/15/1/304