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  2. Visual snow syndrome - Wikipedia

    en.wikipedia.org/wiki/Visual_snow_syndrome

    The dots are usually black/gray on a white background and gray/white on a black background; however, they can also be transparent, white flashing, or colored. Presence of at least 2 additional visual symptoms of the 4 following categories: i. Palinopsia. At least 1 of the following: afterimages or trailing of moving objects. ii.

  3. Ganzfeld effect - Wikipedia

    en.wikipedia.org/wiki/Ganzfeld_effect

    The visual effect is described as the loss of vision as the brain cuts off the unchanging signal from the eyes. The result is "seeing black", [ citation needed ] an apparent sense of blindness. A flickering ganzfeld causes geometrical patterns and colors to appear, and this is the working principle for mind machines and the dream machine .

  4. Visual impairment - Wikipedia

    en.wikipedia.org/wiki/Visual_impairment

    Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]

  5. Cortical visual impairment - Wikipedia

    en.wikipedia.org/wiki/Cortical_visual_impairment

    (The latter is sometimes termed "ocular visual impairment" when discussed in contrast to cortical visual impairment.) Some people have both CVI and a form of ocular visual impairment. CVI is also sometimes known as cortical blindness, although most people with CVI are not totally blind. The term neurological visual impairment (NVI) covers both ...

  6. Inattentional blindness - Wikipedia

    en.wikipedia.org/wiki/Inattentional_blindness

    The following criteria are required to classify an event as an inattentional blindness episode: 1) the observer must fail to notice a visual object or event, 2) the object or event must be fully visible, 3) observers must be able to readily identify the object if they are consciously perceiving it, [3] and 4) the event must be unexpected and the failure to see the object or event must be due ...

  7. How the blind identify and perceive race - AOL

    www.aol.com/news/2015-08-26-how-the-blind...

    Sociologist Asia Friedman, who teaches at the University of Delaware, explored the process and function of racial identification by the blind by interviewing 25 people who became or were born ...

  8. Scotopic vision - Wikipedia

    en.wikipedia.org/wiki/Scotopic_vision

    The normal human observer's relative wavelength sensitivity will not change due to background illumination under scotopic vision. The wavelength sensitivity is determined by the rhodopsin photopigment. This is a red pigment seen at the back of the eye in animals that have a white background to their eye called Tapetum lucidum.

  9. Blind White Cat Discovers the Magic of Fall Through Touch ...

    www.aol.com/blind-white-cat-discovers-magic...

    When it's a blind pet, it takes on a whole new meaning. For Noey, the blind cat, losing his sight hasn't stopped him from enjoying life; it just means there's a lot he has yet to discover about ...