The problem of measuring the objective refractive error with an aberrometer has shown to be more elusive than expected. Here, the formalism of differential geometry is applied to develop a theoretical framework of refractive error sensing. At each point of the pupil, the local refractive error is given by the wavefront curvature, which is a 2 × 2 symmetric matrix, whose elements are directly re...

PURPOSE To examine the effect of myopia, occasionally associated with glaucomatous eyes, on the results obtained by frequency-doubling perimetry (FDP). METHODS Sixty emmetropic or myopic normal volunteers (mean age, 26.2 +/- 0.35 years, mean +/- SEM; range, 19-34) with good visual acuity and without glaucoma were divided into three groups. The groups were emmetropia to low-myopia (mean refrac...

BACKGROUND Uncorrected refractive error is a common cause of preventable visual impairment. Glasses are the cheapest and commonest form of correction of refractive errors. To achieve this, patients must exhibit good compliance to spectacle wear. Patients' attitude and perception of glasses and eye health could affect compliance to spectacle wear. OBJECTIVE To determine the attitude and belief...

purpose : to determine the prevalence of refractive condition and its risk factors among students in mashhad . methods : a total of 2510 students representing a cross-sectional of the population of mashhad were sampled using random cluster sampling strategy. primary and middle school students underwent cycloplegic refraction. the refractive errors of high school students were measured using non...

Partially accommodative esotropia is an acquired strabismus characterized by high hyperopia, a normal AC/A ratio, and a deviation that responds only partially to spectacle correction. Surgery is done for the non-accommodative portion of the deviation. Over-corrections are managed by reducing the hyperopic power of the spectacles. This retrospective study was done to determine the risk factors f...

BACKGROUND The World Health Organization (WHO) definitions of blindness and visual impairment are widely based on best-corrected visual acuity excluding uncorrected refractive errors (URE) as a visual impairment cause. Recently, URE was included as a cause of visual impairment, thus emphasizing the burden of visual impairment due to refractive error (RE) worldwide is substantially higher. The p...

OBJECTIVE This study was carried out to determine the prevalence and pattern of refractive error in patients presenting to a private hospital. MATERIALS AND METHODS Records of all patients who presented at the hospital from 2000 to 2009 with visual acuity (VA) of 6/9 or less and showed improvement in distance vision of one or more lines with refraction were reviewed. The eye with the better p...