The resistance of selected hyperacuity configurations to retinal image degradation.

摘要: Traditional visual acuity is based on resolution of stimulus features, whereas hyperacuity (ie, vernier acuity) relative localization features. Since influenced severely by optical degradation, it often not a suitable measure the status retinal/neural system in conditions degradation. In present study, authors investigate effect degradation various tasks. Thresholds for three types stimuli (line vernier, two-dot and line tilt) were measured under degrees image produced viewing targets through ground glass. The results indicate that when optically degraded, threshold increases only slightly certain separations comparison with acuity, at optimum feature separation quite resistant to This finding demonstrates potential clinical application as test function presence cataracts other media opacities. Invest Ophthalmol Vis Sci 25:389-399, 1984 Hyperacuity term describes special class responses including detection tilt, stereoacuity, related 1 Common these an extremely low performance order 3-5 sec arc optimal conditions, value considerably below traditional thresholds. itself, fact 3 nearly magnitude smaller than intercone spacing human fovea (25 30 arc) implies some additional information processing, beyond available retinal level, required such fine features field. 2 Other properties response, eg, interocular transfer effects interfering neighboring lines, also suggest central locus within neural processing subserving this ability. Our goal study evaluate influence thresholds selected least one respect, limited quality