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Optical Aids define it
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optical system which is used in conjunction with the eye. Optical appliances include spectacles, contact lenses to correct sight and/or anomalies of binocular vision and also telescopes or microscopes to magnify an object. Syn. optical aid
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Optical aids include one or more lenses that are placed between the eyes and the object to promote the magnification or enlargement of the retinal image.
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