BACKGROUND As new methods for corneal curvature measurement have evolved, users of videokeratscopes need to know the practical limitations of these instruments. We assessed agreement between keratometry and videokeratography in measuring highly astigmatic corneas. METHODS Two independent examiners made three keratometric and videokeratographic measurements on each of 33 corneas after penetrat...

PURPOSE To define measures of assessing success and subsequent ways to improve excimer laser treatment of astigmatism. METHODS We studied 97 eyes of 79 patients, followed for 12 months, that underwent photorefractive keratectomy (PRK) for myopia and astigmatism with a VISX 20/20 excimer laser. Preoperative spherical equivalent refraction at the corneal plane was between -1.00 and -15.00 D. Me...

PURPOSE To assess topographical changes in patients with keratoconus while awaiting corneal cross-linking (CXL) treatment. METHODS In this prospective, double-center, observational clinical study, patients with keratoconus were enrolled. Progression was defined as a change in the curvature within the cone area of at least 1.00 diopter (D) on tangential map and a thinning of 20 μm at the thinn...

PURPOSE To assess the biomechanical and keratometric effects and the safety of treatment of progressive keratoconus with UV-riboflavin collagen cross-linking (CXL). METHODS This is a prospective clinical controlled study. Fourteen eyes of 14 patients with progressive keratoconus were treated with CXL after corneal deepithelization. Patients were assessed preoperatively, at week 1 and at month...

In this prospective, unmasked, randomized controlled trial, WittigSilva et al. found that corneal collagen cross-linking leads to sustained improvements in keratometry values and visual acuity in eyes with progressive keratoconus. The authors enrolled 100 patients with keratoconus and evenly divided them into treatment and control groups. The primary outcome was the maximum simulated keratometr...

purpose: to evaluate changes in graft steepness after graft refractive surgery (grs) and to discover influential factors and a coefficient to predict the amount of postoperative shift. methods: keratoconic patients with history of penetrating keratoplasty (pkp) who underwent grs due to high post-pkp astigmatism were included. changes in mean keratometry after grs were evaluated to find possible...

Introduction and purpose. Early use of contact correction for congenital myopia astigmatism in children adolescents contributes to their social rehabilitation. The with lenses provides sustainability absence periods blurred retinal images, which are experienced the glasses. purpose study was determine, through long-term follow-up, extent lens improves uncorrected maximally corrected visual acui...

Background: High astigmatisms are usually induced during corneal suturing subsequent to tissue transplantation or any other surgery which involves corneal suturing. One of the reasons is that the procedure is intimately dependent on the surgeon's skill for suturing identical stitches. In order to evaluate the influence of the irregularity on suturing for the residual astigmatism, a prototype fo...

BACKGROUND Biometric procedures such as keratometry performed shortly after contact procedures like gonioscopy and applanation tonometry could affect the validity of the measurement. This study was conducted to understand the short-term effect of gonioscopy on corneal curvature measurements and surface topography based Simulated Keratometry and whether this would alter the power of an intraocul...