SEPTEMBER 2010 CATARACT & REFRACTIVE SURGERY TODAY EUROPE 25 A stigmatism is an optical defect that may lead to shadowing, loss of contrast sensitivity, distortion, blurred vision, and ghosting. There are two types of astigmatism, regular and irregular. Irregular astigmatism is often caused by a corneal scar or scattering in the crystalline lens. It is estimated that astigmatism of more than -0...

RATIONALE Penetrating astigmatic keratotomy (penetrating AK) is a well-known method to correct corneal astigmatism but rarely be performed nowadays. This article reevaluated the clinical effectiveness and confounding factors of penetrating AK. PATIENT CONCERNS Penetrating AK has been introduced to serve as one alternative operation for astigmatism correction, and is thought to have the potent...

Refractive surgery, both corneal and intraocular, has undergone an explosive evolution during the last 25 years. The first excimer laser surgery performed now already over 25 years ago is a historical landmark which started the scientific age of corneal refractive surgery. Before that momentous occasion, refractive surgery was a buccaneer procedure that lacked consistent scientific knowledge ab...

BACKGROUND Progressive hyperopia is a common complication following radial keratotomy. METHODS Ten eyes of ten consecutive patients with hyperopia after radial keratotomy between +1.75 and +4.00 diopters (D) were treated with the hyperopia module of the Nidek Model EC-5000 excimer laser. The mean preoperative uncorrected visual acuity was 0.38 (20/60+). RESULTS After excimer laser photorefr...

OBJECTIVE To compare mean healing times after debridement, debridement with grid keratotomy, and superficial keratectomy in cats with nonhealing corneal ulcers. DESIGN Retrospective study. ANIMALS 29 cats with 36 nonhealing corneal ulcers. PROCEDURE Medical records of cats with nonhealing corneal ulcers were reviewed. Signalment, duration of clinical signs, ophthalmic abnormalities, and r...