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The colors and whatnot that you see when you close your eyes are discussed in our Phosphene article, and its "Electrical stimulation" section discusses electrically induced phosphenes in blind people. They weren't blind since birth. Seems like an easy question would be whether blind people see ordinary "pressure phosphenes" but I don't know.
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]
However, as of 2021 such theories do not have empirical support. [3] The lack of visual sensory feedback in blind people is known to affect the calibration process for body movement. [ 7 ] It is also suspected that reinforcement of behavior plays a role in the development of RRBs. [ 1 ]
Eigengrau (German for "intrinsic gray"; pronounced [ˈʔaɪ̯gŋ̍ˌgʁaʊ̯] ⓘ), also called Eigenlicht (Dutch and German for "intrinsic light"), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the absence of light.
The question was originally posed to him by philosopher William Molyneux, whose wife was blind: [2] Suppose a man born blind, and now adult, and taught by his touch to distinguish between a cube and a sphere of the same metal, and nighly of the same bigness, so as to tell, when he felt one and the other, which is the cube, which is the sphere.
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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People with RM have a reduced visual acuity, (usually about 0.1 or 20/200), have total color blindness, photo-aversion and nystagmus. The nystagmus and photo-aversion usually are present during the first months of life, and the prevalence of the disease is estimated to be 1 in 30,000 worldwide. [ 3 ]