Five amblyopes viewed high contrast square wave gratings of 8 different spatial frequencies all presented at very high luminance. They were required to indicate the orientation of the grating, horizontal or vertical, and received immediate auditory feedback if incorrect. Each amblyope viewed 480 grating presentations daily for 15 days over 3 weeks. After this 'treatment' improvements in visual acuity and/or visually evoked potentials were observed and persisted after treatment.
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