Abstract
Campbell and Hess developed a new technique for treating amblyopia. This technique involves stimulation of the amblyopic eye for precise time intervals with a graded series of contrast frequency gratings. Partial occlusion is used only during the treatment. Treating strabismic and anisometropic amblyopes by the Campbell-Hess amblyopia training technique produced an improvement of 2 lines on the acuity chart in 6 of 14 patients.

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