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  2. Visual snow syndrome - Wikipedia

    en.wikipedia.org/wiki/Visual_snow_syndrome

    Poor quality of vision, Photophobia, Heliophobia, Depersonalization and Derealization [2] Usual onset: Visual Snow can appear at any time, but it commonly appears at birth, late teenage years, and early adulthood. Causes: Unknown, [3] hyperexcitability of neurons and processing problems in the visual cortex [4] [5] Risk factors

  3. McCollough effect - Wikipedia

    en.wikipedia.org/wiki/McCollough_effect

    Of course, if the induced area is in the fovea (central vision) and the eyes are allowed to move, then the effect will appear everywhere in the visual scene visited by the fovea. The effect is also optimal when the thickness of the bars in the induction stimulus matches that of those in the test stimulus (i.e., the effect is tuned, albeit ...

  4. Color blindness - Wikipedia

    en.wikipedia.org/wiki/Color_blindness

    Color blindness is usually an inherited problem or variation in the functionality of one or more of the three classes of cone cells in the retina, which mediate color vision. [2] The most common form is caused by a genetic condition called congenital red–green color blindness (including protan and deutan types), which affects up to 1 in 12 ...

  5. Overview of common vision problems and medications - AOL

    www.aol.com/overview-common-vision-problems...

    Refractive errors, some of the most common types of vision problems, cannot be treated with medication, for example. Instead, glasses, contact lenses, and surgery are used to correct them as ...

  6. Having problems seeing 3D? The American Optometric ... - AOL

    www.aol.com/news/2010-05-20-having-problems...

    With up to 56 percent of people living with binocular vision problems that could impede their ability to see 3D, the American Optometric Association is recommending those experiencing ...

  7. Amsler grid - Wikipedia

    en.wikipedia.org/wiki/Amsler_grid

    Patients with macular disease may see wavy lines or some lines may be missing. Amsler grids are supplied by ophthalmologists, optometrists or from web sites, and may be used to test one's vision at home. The original Amsler grid was black and white.

  8. Illusory palinopsia - Wikipedia

    en.wikipedia.org/wiki/Illusory_palinopsia

    Illusory palinopsia is often worse with high stimulus intensity and contrast ratio in a dark adapted state.Multiple types of illusory palinopsia often co-exist in a patient and occur with other diffuse, persistent illusory symptoms such as halos around objects, dysmetropsia (micropsia, macropsia, pelopsia, or teleopsia), Alice in Wonderland Syndrome, visual snow, and oscillopsia.

  9. Phosphene - Wikipedia

    en.wikipedia.org/wiki/Phosphene

    An artist's representation of how some people may see phosphenes by retinal stimulation. A phosphene is the phenomenon of seeing light without light entering the eye. The word phosphene comes from the Greek words phos (light) and phainein (to show). Phosphenes that are induced by movement or sound may be associated with optic neuritis. [1] [2]

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