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Motion perimetry in anisometropic amblyopia: Elevated size thresholds extend into the midperiphery
Journal article   Peer reviewed

Motion perimetry in anisometropic amblyopia: Elevated size thresholds extend into the midperiphery

Sean P Donahue, Michael Wall and Kim E Stanek
Journal of AAPOS, Vol.2(2), pp.94-101
1998
DOI: 10.1016/S1091-8531(98)90071-4
PMID: 10530970

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Abstract

Purpose: Our purpose was to determine whether motion detection abnormalities in patients with anisometropic amblyopia exist and to determine the extent of these abnormalities in the central and midperipheral visual field. Methods: We used of motion perimetry to evaluated 10 anisometropic subjects with no manifest strabismus. Each of 44 locations in the visual field corresponding to the test sites of the Humphrey 24-2 program was tested with circular patches of motion (random dot cinematograms) displayed on a computer screen. Stimulus patch size was reduced in a 2 1 staircase manner to determine the smallest patch of motion detectable at each test location (threshold). Data from 15 age-matched normal subjects were used as controls. Results: Vision in the amblyopic eye ranged from 20 25 to count fingers. The overall mean size threshold for amblyopic eyes was elevated (61% ± 73%) compared with fellow eyes and age-matched normal eyes ( p < 0.03) (i.e., the moving patch of dots in the field had to be larger for it to be detected when viewing with the amblyopic eye). The increase in size threshold was consistent across the visualfield and was not greater for central locations. Conclusion: The amblyopia caused by anisometropia is associated with an abnormality in motion detection that extends into the midpheriphery of the visual field.

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