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To the Editor:
—The advantageous use of monocular occlusion for long periods for both diagnostic and therapeutic purposes has been established. In a recent report from the Dartmouth Eye Institute the remarkable benefits to be derived from such prolonged monocular occlusion are detailed. In a number of cases permanent monocular occlusion was found to be the only way to relieve intolerable ocular distress. In over 50 per cent of a series of 80 cases relief was obtained during occlusion and with the prescription obtained after the period of occlusion. The great problem is how to provide an occluder which will not be disfiguring. Monocular occlusion would certainly be much more widely practiced if it were possible to do so with an inconspicuous occluder. An opaque contact lens is probably best, but its use is not always feasible.The real purpose of occlusion, it seems to me. is to prevent binocular