Effects of early and late onset strabismic amblyopia on magnocellular and parvocellular visual function

ABSTRACT: Contrast sensitivities were measured to an achromatic 0.8 c.p.d. grating with rapid onset to measure magnocellular sensitivity and to a red-green isoluminant grating of 3.2 c.p.d. and a slow onset to assess parvocellular function. Fifteen early and fourteen late onset strabismic amblyopes with similar ranges of visual acuity were studied and the data compared with those from 15 age-matched normal subjects.