Introduction: contrast sensitivity is one of the most important psychophysical tests that may be used for the evaluation of refractive state of eye and retinal image quality. Yellow vs. blue color contrast sensitivity may be more suitable in this regard. Materials and Methods: thirty myopic eyes were considered in this study. Yellow vs. blue color contrast sensitivity was evaluated under the sa...

Contrast sensitivity at different positions in the visual field has been measured at various spatial frequencies using a patch of gratin, 0 suitabij tignetted to give a st!mulus localized in both space and spatial frequent\. While contrast sensitivitl along a vertical line through the fixation point f4is ofl’ steadily from a maximum at the crntre. sensitivity along a horizontal line displaced 1...

purpose: to determine the effect of occluding a normal eye on visual acuity, contrast sensitivity and stereopsis in amblyopic school children. methods: amblyopic children from primary schools of region 2 in mashhad were identified and referred to optometry clinics of mashhad medical university through a screening program. informed consent was obtained from the parents. all subjects underwent an...

Contrast sensitivity has been measured as a function of the eccentricity along several meridians. The measurements were carried out with a two-dimensional sinusoidal grating (cross grating) presented in a surround with a luminance equal to the average stimulus luminance. The advantage of this stimulus over a one-dimensional grating is that it permits presentation of small-sized stimuli. in a su...

purpose: to determine the effect of photorefractive keratectomy (prk) on improvement of involuntary eye movements and visual functions in myopic patients with congenital nystagmus. methods: this prospective interventional case series included patients with congenital nystagmus and myopia ≥ -1 d who underwent prk over a 2-year period. complete ophthalmological examinations including visual acuit...