1. Depth Perception and Grasp in Central Field Loss
- Author
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Preeti Verghese, Donald C. Fletcher, Saeideh Ghahghaei, and Terence L. Tyson
- Subjects
Male ,Visual acuity ,genetic structures ,Binocular summation ,central field loss ,Visual Acuity ,Macular Degeneration ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Humans ,Vision test ,Low Vision ,Scotoma ,binocular visual field ,Aged ,Aged, 80 and over ,Depth Perception ,Vision, Binocular ,Vision Tests ,Middle Aged ,stereopsis ,eye diseases ,Visual field ,Stereoscopic acuity ,Stereopsis ,030221 ophthalmology & optometry ,Optometry ,Female ,sense organs ,Cues ,Visual Fields ,medicine.symptom ,Depth perception ,Psychology ,Binocular vision ,030217 neurology & neurosurgery - Abstract
Purpose We set out to determine whether individuals with central field loss benefit from using two eyes to perform a grasping task. Specifically, we tested the hypothesis that this advantage is correlated with coarse stereopsis, in addition to binocular summation indices of visual acuity, contrast sensitivity, and binocular visual field. Methods Sixteen participants with macular degeneration and nine age-matched controls placed pegs on a pegboard, while their eye and hand movements were recorded. Importantly, the pegboard was placed near eye height, to minimize the contribution of monocular cues to peg position. All participants performed this task binocularly and monocularly. Before the experiment, we performed microperimetry to determine the profile of field loss in each eye and the locations of eccentric fixation (if applicable). In addition, we measured both acuity and contrast sensitivity monocularly and binocularly, and stereopsis by using both a RanDot test and a custom stereo test. Results Peg-placement time was significantly shorter and participants made significantly fewer errors with binocular than with monocular viewing in both the patient and control groups. Among participants with measurable stereopsis, binocular advantage in peg-placement time was significantly correlated with stereoacuity (ρ = -0.78; P = 0.003). In patients without measurable stereopsis, the binocular advantage was related significantly to the overlap in the scotoma between the two eyes (ρ = -0.81; P = 0.032). Conclusions The high correlation between grasp performance and stereoacuity indicates that coarse stereopsis may benefit tasks of daily living for individuals with central field loss.
- Published
- 2016
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