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3. Diplopia - Wikipedia

   en.wikipedia.org/wiki/Diplopia

   Diplopia is the simultaneous perception of two images of a single object that may be displaced horizontally or vertically in relation to each other. [1] Also called double vision, it is a loss of visual focus under regular conditions, and is often voluntary.

4. Lenticular lens - Wikipedia

   en.wikipedia.org/wiki/Lenticular_lens

   These lenses are generally used for plus (hyperopic) corrections at about 12 diopters or higher. A similar sort of eyeglass lens is the myodisc, sometimes termed a minus lenticular lens, used for very high negative corrections. More aesthetic aspheric lens designs are sometimes fitted. [3]

5. Wedge prism - Wikipedia

   en.wikipedia.org/wiki/Wedge_prism

   The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism.

6. Cover test - Wikipedia

   en.wikipedia.org/wiki/Cover_test

   A cover test or cover-uncover test is an objective determination of the presence and amount of ocular deviation.It is typically performed by orthoptists, ophthalmologists and optometrists during eye examinations.

7. Prism cover test - Wikipedia

   en.wikipedia.org/wiki/Prism_Cover_Test

   The prism cover test (PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]