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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]
Hysterical blindness (nowadays known as conversion disorder), the appearance of neurological symptoms without a neurological cause. Inattentional blindness or perceptual blindness, failing to notice some stimulus that is in plain sight. Motion blindness, a neuropsychological disorder causing an inability to perceive motion.
In inattentional blindness experiments, participants fail to identify some stimulus in a single display, a phenomenon that doesn't rely on memory the way change blindness does. [18] Inattentional blindness refers to an inability to identify an object all together whereas change blindness is a failure to compare a new image or display to one ...
Stereoblindness (also stereo blindness) is the inability to see in 3D using stereopsis, or stereo vision, resulting in an inability to perceive stereoscopic depth by combining and comparing images from the two eyes. Individuals with only one functioning eye have this condition by definition since the visual input of the second eye does not exist.
A blind spot, scotoma, is an obscuration of the visual field. A particular blind spot known as the physiological blind spot , "blind point", or punctum caecum in medical literature, is the place in the visual field that corresponds to the lack of light-detecting photoreceptor cells on the optic disc of the retina where the optic nerve passes ...
Cortical blindness is the total or partial loss of vision in a normal-appearing eye caused by damage to the brain's occipital cortex. [1] Cortical blindness can be acquired or congenital, and may also be transient in certain instances. [ 2 ]
The first school for blind adults was founded in 1866 at Worcester and was called the College for the Blind Sons of Gentlemen. Georgia Academy for the Blind, Macon, Georgia, US, circa 1876. In 1889 the Edgerton Commission published a report that recommended that the blind should receive compulsory education from the age of 5–16 years.
Recovery from blindness is the phenomenon of a blind person gaining the ability to see, usually as a result of medical treatment. As a thought experiment , the phenomenon is usually referred to as Molyneux's problem .
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