INTEROCULAR TRANSFER OF THE MOVEMENT AFTEREFFECT IN CENTRAL AND PERIPHERAL-VISION OF PEOPLE WITH STRABISMUS

Purpose. To compare binocularity in central and peripheral vision of p eople with early-onset strabismus and people with normal binocular vis ion. Methods. Ten subjects with early-onset strabismus, and nine subje cts with normal binocular vision were tested. To assess binocularity, interocular transfer (IOT) of a rotary movement aftereffect (MAE) was measured. The MAE stimuli were either confined to the central 2.8 degr ees of the visual field or were presented 10 degrees into peripheral v ision. Results. In peripheral vision, there was no significant differe nce in IOT for the two groups of subjects. In central vision, there wa s a significant decrease of IOT in subjects with early-onset strabismu s. Their IOT was, however, significantly greater than zero. Conclusion s. Early-onset strabismus appears to spare binocularity in peripheral vision but reduces it in central vision. It does not abolish binocular ity assessed by IOT of MAE, suggesting that some binocular connections survive early-onset strabismus, even in central vision.