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2. Polarized 3D system - Wikipedia

   en.wikipedia.org/wiki/Polarized_3D_system

   A polarized 3D system uses polarization glasses to create the illusion of three-dimensional images by restricting the light that reaches each eye (an example of stereoscopy). To present stereoscopic images and films, two images are projected superimposed onto the same screen or display through different polarizing filters .

3. 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 ]

4. Lenticular printing - Wikipedia

   en.wikipedia.org/wiki/Lenticular_printing

   Close-up of the surface of a lenticular print. Lenticular printing is a technology in which lenticular lenses (a technology also used for 3D displays) are used to produce printed images with an illusion of depth, or the ability to change or move as they are viewed from different angles.

5. Optical illusion can tell if you need glasses - AOL

   www.aol.com/news/2015-05-14-optical-illusion-can...

   Cover one eye; read the letters aloud. Cover the other eye; read the letters aloud. Ah, the standard eye exam. A few lines of text and the doctor can tell you whether you have poor vision. But let ...

6. Adjustable-focus eyeglasses - Wikipedia

   en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

   Distance vision corrections are made by re-adjusting the lens for distance, instead of by tilting and/or rotating the head to view object through the best part of the lens for the distance. Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi ...

7. Lancaster red-green test - Wikipedia

   en.wikipedia.org/wiki/Lancaster_red-green_test

   One light is held by the clinician, the other by the patient. The clinician points the light to a screen, requesting the patient to bring the second light to align on top of it. The patient's eye positions are measured while the patient performs the test. [2] Advantageously, monocular occlusion is applied before the test for at least 30 minutes.

8. Adaptive optics - Wikipedia

   en.wikipedia.org/wiki/Adaptive_optics

   Adaptive and active optics are also being developed for use in glasses to achieve better than 20/20 vision, initially for military applications. [24] After propagation of a wavefront, parts of it may overlap leading to interference and preventing adaptive optics from correcting it. Propagation of a curved wavefront always leads to amplitude ...

9. Haidinger's brush - Wikipedia

   en.wikipedia.org/wiki/Haidinger's_brush

   This is followed shortly by Haidinger's brush." He commented that not all observers see it in the same way. Some see the yellow pattern as solid and the blue pattern as interrupted, as in the illustrations on this page. Some see the blue as solid and the yellow as interrupted, and some see it alternating between the two states.