Eye Patching and Visual Evoked Potential Acuity in Children Four Months to Eight Years Old

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Abstract
The monocular visual acuities of 6 children aged 4 mo. to 8 yr were measured using visual evoked potentials (VEP) before and during patching therapy. A 7th child had both Snellen and VEP monocular acuties determined before patching. In a cooperative child, it was estimated that VEP acuity was within 0.25 octaves (1 line on an eye chart) of Snellen acuity. In the 4 children < 3 yr of age, patching resulted in a 1.8-octave decrease in acuity of the patched eye and a 2.0-octave improvement in the unpatched eye. After cessation of patching therapy, acuity of the previously patched eye improved 2.0 octaves and that of the abnormal eye declined 1.75 octaves. In the 2 children > 4 yr, patching resulted in a 1.25-octave acuity decrease in the patched eye. Cessation of patching resulted in a 1.25-octave improvement in acuity of the patched eye. No permanent deleterious effects of patching on acuity were observed.

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