Use of light intensity reduction for amblyopia therapy

A form of amblyopia therapy is presented using light intensity reduction which provides a means of increasing the visual acuity in the amblyopic eye while preserving and promoting binocularity. In addition to the rationale and specific instructions for therapy, an illustrative case is presented of a 7-year-old boy with anisometropic amblyopia and eccentric fixation who was treated with light intensity reduction produced by Polaroid filters before his nonamblyopic eye. In this case acuity improved from 6/30 (20/100) to 6/7.8 (20/26), fixation improved from 2 degrees eccentric to unsteady central, and stereopsis increased from no measurable amount to 140 sec as measured by the Randot stereotest.