Abstract: A contact lens has a central circular region treated to make it translucent. The diameter of the translucent region is at least great enough to cover the pupil of the eye. Light passes through the central region of the lens but the image normally seen is blurred sufficiently so that it cannot be visualized. The lens is deposited on the pupil of the eye which is normally dominant for those who have eye dominance crossover such that where critical viewing along the sights of a gun or optical instrument, for example, must be performed by the other eye, visual dominance is transferred to said other eye.

Abstract: A contact lens has a central circular region treated to make it translucent. The diameter of the translucent region is at least great enough to cover the pupil of the eye. Light passes through the central region of the lens but the image normally seen is blurred sufficiently so that it cannot be visualized. The lens is deposited on the pupil of the eye which is normally dominant for those who have eye dominance crossover such that where critical viewing along the sights of a gun or optical instrument, for example, must be performed by the other eye, visual domiance is transferred to said other eye.

Abstract: A thin flexible disk of opaque material and at least one flexible disk comprised of a translucent plastic material is provided in a kit. A shooter aims a weapon such as a rifle in the normal fashion with the optical axis of one eye aligned with the rear and front sights on the rifle. While the rifle is being aimed, the other eye, that is, the eye which is not consciously doing any aiming, has the opaque disk applied to the lens of the shooter's glasses. The opaque disk is then moved around until it is aligned with the pupil and on the optical axis of said other eye. A translucent disk is then applied coincidentally with the opaque disk after which the tentatively adhered opaque disk is removed.