PURPOSE To assess the accuracy of intraocular lens (IOL) power prediction for cataract surgery with open angle glaucoma (OAG) and to identify preoperative angle parameters correlated with postoperative unpredicted refractive errors. MATERIALS AND METHODS This study comprised 45 eyes from 45 OAG subjects and 63 eyes from 63 non-glaucomatous cataract subjects (controls). We investigated differe...

BACKGROUND: School-based visual acuity screening activities calculate the rates of students with possible refractive errors (REs). School staff informs results children’s parents and need for an in-depth examination to assist RE. AIM: The study aimed identify prevalence REs among secondary based school in some provinces Vietnam. METHODS: There are 4838 participating survey. All them were screen...

purpose: the association between deafness and ocular abnormalities is well established however the nature and prevalence of these problems are diverse across the globe. methods: a team of optometrists and social worker visited one hundred fifty eight deaf boy students at their schools and those who needed more detailed evaluation were referred to the farabi eye hospital's strabismus clinic...

purpose : to determine add power (ap) and amplitude of accommodation (aa) in a sample of iranian population and its relationship with refractive errors methods : this cross-sectional study enrolled people of 35-70 years old by simple random sampling. exclusion criteria were myopia or hyperopia over 6 diopter (d) and astigmatism more than 0.75 d. those with a history of eye disorders and taking ...

purpose : to determine the prevalence of the refractive errors in the elderly population of sari, iran methods : in this study, after selecting the participants through random cluster sampling, they all received ocular examinations including visual acuity (va) measurement, refraction, fundoscopy and tonometry. after measuring uncorrected visual acuity (ucva), non-cycloplegic refraction was perf...

conclusions the pattern of visual impairment in learning-impaired children is not much different from that in normal children; however, because these children may not be able to express themselves clearly, lack of correct diagnosis and appropriate treatment has resulted in a marked defect in recognizing visual disorders in these children. therefore, gaining knowledge of the prevalence of refrac...

PURPOSE This article proposes a simple model that describes the quantitative relationship between unaided visual acuity and blur attributed to refractive errors. METHODS The standard model for describing the relationship between visual acuity and blur, as published by Raasch, is used as a starting point to develop a simpler model based on heuristic arguments. The basis of Raasch's data is aug...

The knowledgeable pediatrician can make a significant contribution to the management of refractive errors by aiding in the early recognition of abnormalities, making appropriate referrals, and reinforcing the ophthalmologist's recommendations to the family. If this article has focused the reader's attention and caused a few rays of light to fall on an important subject, it has achieved its purp...

THERE are some features relative to the size of the retinal images in these two conditions which are of general interest, though they are rarely discussed. Axial Ametropia.-The " basic " (blurred) retinal image is smallest in hyperopia, intermediate in emmetropia, and largest in myopia. The size of a blurred retinal image is best taken from the points in the diffusion circles at the extremities...

The near retinoscopy technique of refractive error determination was compared to the standard method of cycloplegic refraction using 10 "infants" (3-12 months of age) and 10 "children" (32-109 months of age). There was a significant difference between the techniques for both sphere and cylinder power. Although there was no interaction of refractive technique and age group, the difference betwee...