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A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions. The most common application for this is the treatment of strabismus. By moving the image in front of the deviated eye, double vision can be avoided and comfortable binocular vision can be achieved.
Stereopsis recovery. Eye patches may strengthen the weaker eye but fail to stimulate binocular vision and stereopsis, which may sometimes be recovered by different means. Stereopsis recovery, also recovery from stereoblindness, is the phenomenon of a stereoblind person gaining partial or full ability of stereo vision ( stereopsis ).
Efforts must first be made to identify and treat the underlying cause of the problem. Treatment options include eye exercises, [2] wearing an eye patch on alternative eyes, [2] [24] prism correction, [26] [24] [27] and in more extreme situations, surgery [5] [28] or botulinum toxin. [29]
Treatment options for esotropia include glasses to correct refractive errors (see accommodative esotropia below), the use of prisms, orthoptic exercises, or eye muscle surgery.
Duplex retina. The distribution of human photoreceptor cells shows how the photopic and scotopic systems exist in parallel, except in the fovea where the photopic system dominates. A duplex retina is a retina consisting of both rod cells and cone cells, [1] which are the photoreceptor cells for two parallel but mostly separate visual systems.
Treatment. Convergence insufficiency may be treated with convergence exercises prescribed by an eyecare specialist trained in orthoptics or binocular vision anomalies (see: vision therapy ). Some cases of convergence insufficiency are successfully managed by prescription of eyeglasses, sometimes with therapeutic prisms .