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A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.
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 ...
The provider may prescribe an eye patch to relieve the double vision. The patch can be removed after the nerve heals. Surgery or special glasses (prisms) may be advised if there is no recovery in 6 to 12 months.
Bates felt that corrective lenses, which he characterized as "eye crutches", are an impediment to curing poor vision. In his view, "strain" would increase as the eyes adjust to the correction in front of them.
Optical aniseikonia due to anisometropia can be corrected by spectacles, contact lenses or refractive corneal surgeries. Spectacle correction is done by changing the optical magnification properties of the auxiliary optics (corrective lenses).
- Double-slit experiment - Wikipediawikipedia.org
If the focal lengths of the two lenses for light at the yellow Fraunhofer D-line (589.2 nm) are f 1 and f 2, then best correction occurs for the condition: f 1 ⋅ V 1 + f 2 ⋅ V 2 = 0 {\displaystyle f_{1}\cdot V_{1}+f_{2}\cdot V_{2}=0}