A laminar cortical model of stereopsis and 3D surface perception is developed and simulated. The model shows how spiking neurons that interact in hierarchically organized laminar circuits of the visual cortex can generate analog properties of 3D visual percepts. The model describes how monocular and binocular oriented filtering interact with later stages of 3D boundary formation and surface fil...

When stereoscopic images are presented alternately to the two eyes, stereopsis occurs at F ≥ 1 Hz full-cycle frequencies for very simple stimuli, and F ≥ 3 Hz full-cycle frequencies for random-dot stereograms (eg Ludwig I, Pieper W, Lachnit H, 2007 "Temporal integration of monocular images separated in time: stereopsis, stereoacuity, and binocular luster" Perception & Psychophysics69 92-102). U...

The tuning of the transient-stereopsis system to luminance contrast and spatial-frequency (SF) was investigated with narrow-band gabor targets with a constant sigma of 1 degree. They were presented for brief (140 ms) durations and subtended a large (6 degrees) disparity. When dichoptic gabor stimuli were matched in SF (0-5 cpd), transient stereo performance was either uniform across SF or great...

INTRODUCTION The purpose of this study was to show to what extent developmental dyslexia influences a scope of stereoscopic. MATERIAL AND METHODS 176 pupils and students with developmental dyslexia were examined, including 52 girls and 124 boys aged between 8 and 19. Subjects were divided into three groups in respect of their age: I group 8-10 years, II group 10-14 years, III group 15-19 year...

PURPOSE To compare the vision-screening results of school-aged children tested with EyeSpy software and those of children examined by a pediatric ophthalmologist. We also compared combined results of an electronic visual acuity (EVA) tester and stereopsis testing to the results of a professional eye examination. METHODS In this pilot study, all children were tested with an EyeSpy and ETDRS EV...

OBJECTIVES To determine the most common ocular causes and types of abnormal head position (AHP) and describe their clinical features. MATERIALS AND METHODS Patients with AHP who had been followed in the strabismus unit were retrospectively reviewed. Demographic features and orthoptic characteristics were recorded. RESULTS A total of 163 patients including 61 women (37.4%) and 102 men (62.6%...

Amblyopia is a neuro-developmental disorder of the visual cortex that arises from abnormal visual experience early in life. Amblyopia is clinically important because it is a major cause of vision loss in infants and young children. Amblyopia is also of basic interest because it reflects the neural impairment that occurs when normal visual development is disrupted. Amblyopia provides an ideal mo...