As technology and medical devices improve, there is much interest in when and how astigmatism should be corrected with refractive surgery. Astigmatism can be corrected by most forms of refractive surgery, such as using excimer lasers algorithms to ablate the cornea to compensate for the magnitude of refractive error in different meridians. Correction of astigmatism at the time of cataract surge...

conclusions the prevalence of astigmatism was high in children under six years old in this study, and to control amblyopia, it is necessary to consider astigmatism at younger ages. results the prevalence of refractive astigmatism of more than 0.5d in at least one eye was 51.4% (95% confidence interval (ci): 50.7-52.1); 52.1% in girls and 50.7% in boys (p = 0.412). prevalence of astigmatism decr...

In modern cataract surgery, spectacle freedom is becoming more and more important. Emmetropia can be achieved for patients with myopic or hyperopic refractive errors by selecting the appropriate spherical lens power. However, approximately 20% of patients who undergo cataract surgery have 1.25 diopters (D) of corneal astigmatism or more. (FerrerBlasco, Montes-Mico et al. 2009; Hoffmann and Hutz...

background: the latest who report indicates that refractive errors are the leading cause of visual impairment throughout the world. the aim of this study was to determine the prevalence of myopia, hyperopia, and astigmatism in 7 yr old children in iran. methods : in a cross-sectional study in 2013 with multistage cluster sampling, first graders were randomly selected from 8 cities in iran. all ...

PURPOSE To evaluate the effect of non-keratometric ocular astigmatisms on visual and refractive outcomes after photorefractive keratectomy (PRK) for correction of myopic astigmatisms. METHODS Seventy one eyes of 36 subjects were enrolled in this study. Patients underwent PRK for treatment of myopia. Subjects were evaluated for refractive error, keratometry, and visual acuity before and six mo...

RESULTS: No statistically significant differences were found in corneal astigmatism vectorial decomposition (J0 and J45) between the preoperative evaluation and each postoperative visit (p > 0.05). However, statistically significant differences in refractive astigmatism vectorial decomposition (J0 and J45) were found between preoperative and postoperative measurements (p < 0.05). Refractive ast...

PURPOSE To investigate the refractive status and optical components of premature babies with or without retinopathy of prematurity (ROP) at 3-4 years old, and to explore the influence of prematurity and ROP on the refractive status and optical components. METHODS Premature babies receiving fundus examination were recruited into ROP group and non-ROP group, with age-matched full-term babies as...

INTRODUCTION Refractive errors are a major cause of visual impairment in the population. PURPOSE To find the pattern of refractive errors among patients evaluated in a tertiary care hospital in the western region of Nepal. MATERIALS AND METHODS The present hospital-based retrospective study was conducted in the Department of Ophthalmology of the Manipal Teaching Hospital, situated in Pokhar...

Modern cataract and refractive surgery aims not only to improve vision but to provide a good unaided visual acuity. Correcting astigmatic errors and control of surgically induced astigmatism are now an integral part of such operative procedures. Technological innovations and surgical developments in recent times have provided new methods for correction of astigmatism. However, evaluating the ou...

INTRODUCTION LASIK surgery is currently the preferred procedure to correct low to moderate myopia. The aim of this study was to determine the orientation of the steepest meridian of regular astigmatism in order to determine the relative incidence of vertical, horizontal, and oblique regular astigmatism among highly myopic Egyptian patients seeking non-ablative surgical correction of the refract...