Predicting of Uncorrected Astigmatism from Decimal Visual Acuity in Spherical Equivalent
نویسندگان
چکیده
منابع مشابه
Effect of pupil size on uncorrected visual acuity in pseudophakic eyes with astigmatism.
PURPOSE To study the effect of pupil size on the relationship between refractive astigmatism and uncorrected distance visual acuity (UDVA) and pseudoaccommodation in pseudophakic eyes. METHODS Thirty-six eyes from 36 patients who underwent phacoemulsification and intraocular lens (IOL) implantation were included. All eyes were divided into two groups based on the presence of postoperative-wit...
متن کاملPredicting visual acuity from wavefront aberrations.
It is now possible to routinely measure the aberrations of the human eye, but there is as yet no established metric that relates aberrations to visual acuity. A number of metrics have been proposed and evaluated, and some perform well on particular sets of evaluation data. But these metrics are not based on a plausible model of the letter acuity task and may not generalize to other sets of aber...
متن کاملPredicting visual acuity from the structure of visual cortex.
Three decades ago, Rockel et al. proposed that neuronal surface densities (number of neurons under a square millimeter of surface) of primary visual cortices (V1s) in primates is 2.5 times higher than the neuronal density of V1s in nonprimates or many other cortical regions in primates and nonprimates. This claim has remained controversial and much debated. We replicated the study of Rockel et ...
متن کاملVisual acuity in simple myopic astigmatism: influence of cylinder axis.
PURPOSE The relationship between astigmatic refractive errors and their associated visual acuity has been studied in recent years in the context of refractive power space. The influence of the axis of astigmatism remains a matter of controversy. Our goal in this study is to provide additional experimental evidence to clarify this subject. The influence of the simulated axis orientation was comp...
متن کاملSpherical equivalent refractive error in preschool children from a population with a high prevalence of astigmatism.
PURPOSE To describe spherical equivalent (sph eq) refractive errors in preschool members of a Native American tribe with a high prevalence of astigmatism. METHODS Cycloplegic autorefraction measurements were obtained for 819 three- and four-year-old Tohono O'odham children, with follow-up measurements in 146 after 4 to 8 years. RESULTS Mean sph eq was significantly more hyperopic in the ast...
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ژورنال
عنوان ژورنال: Journal of the Optical Society of Korea
سال: 2013
ISSN: 1226-4776
DOI: 10.3807/josk.2013.17.2.219