Topic
Contrast (vision)
About: Contrast (vision) is a research topic. Over the lifetime, 10379 publications have been published within this topic receiving 221480 citations.
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TL;DR: The results indicated that the treated amblyopes remained deficient in spatial vision, especially at high spatial frequencies, although their Snellen visual acuity had become normal in the pAEs, and it was suggested that other tests of spatial vision should be used to assess treatment outcomes of amblyopia therapies.
77 citations
TL;DR: In this paper, the contrast of a polychromatic speckle pattern can be calculated from the spectral coherence of the scattered amplitude, and the analytical relationship between the contrast and r.m.s. surface roughness is derived.
Abstract: It is shown how the contrast of a polychromatic speckle pattern can be calculated from the spectral coherence of the scattered amplitude. For gaussian surfaces and relatively narrow spectral profiles an analytical relationship between speckle contrast and r.m.s. surface roughness is derived. The theoretical results are compared with available experimental data and discrepancies are explained.
77 citations
Patent•
01 Dec 2005TL;DR: In this paper, an intraocular lens (IOL) having an optic with a posterior and an anterior refractive surfaces, at least one of which has an aspherical profile, typically characterized by a non-zero conic constant, for controlling the aberrations of a patient's eye in which the IOL is implanted is presented.
Abstract: The present inventions provides an intraocular lens (IOL) having an optic with a posterior and an anterior refractive surfaces, at least one of which has an aspherical profile, typically characterized by a non-zero conic constant, for controlling the aberrations of a patient’s eye in which the IOL is implanted Preferably, the IOL’s asphericity, together with the aberrations of the patient’s eye, cooperate to provide an image contrast characterized by a calculated modulation transfer function (MTF) of at least about o25 and a depth of field of at least about o75 diopters
77 citations
TL;DR: The sweep VECP is concluded to be a valid method, giving estimates of acuity which correlate well with optotype acuity and correspond well to other clinical findings, and that it can be useful in the clinical management of nonverbal patients.
Abstract: Previous studies have indicated that visual acuities of normal infants can be estimated with good accuracy using swept spatial frequency visual-evoked-potentials (VECPs). In this report we describe acuity measurements obtained with this technique from 304 examinations performed on 135 children having various visual disorders. When possible, two or more different stimulation frequencies (8, 12, 15 or 24 contrast reversals/sec) were used in each patient, and three to eight sweep VECPs were obtained from each patient under each simulation and recording condition. High correlation coefficients (0.94 - 0.96) between the acuity estimated on each patient from either the single sweep giving the best visual acuity (BSS) or from vector averages (VeA) of the EEG data obtained from several sweeps confirmed previous findings in normal infants. We also found high correlation coefficients among BSS recorded at different temporal frequencies (0.79-0.97) and among comparisons of BSS or VeA acuity to optotype visual acuity (0.6-0.89). Children with clinically undetectable optokinetic responses showed lower visual acuity estimated by BSS than those who demonstrated optokinetic nystagmus. We conclude that the sweep VECP is a valid method, giving estimates of acuity which correlate well with optotype acuity and correspond well to other clinical findings, and that it can be useful in the clinical management of nonverbal patients.
77 citations
TL;DR: Investigating the correlation between visual acuity, contrast sensitivity, and contrast sensitivity with glare source (glare sensitivity), and the degree of posterior capsule opacification (PCO) before and after neodymium:yttrium-aluminum-garnet (Nd:YAG) laser posterior capsulotomy found visual acute has a stronger association with PCO than does contrast sensitivity or glare sensitivity and therefore should be considered to reflect most accurately thedegree of PCO.
77 citations