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The terms partially sighted, low vision, legally blind and totally blind are used by schools, colleges, and other educational institutions to describe students with visual impairments. [21] They are defined as follows: Partially sighted indicates some type of visual problem, with a need of person to receive special education in some cases.
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 ...
A scotoma is an area of partial alteration in the field of vision consisting of a partially diminished or entirely degenerated visual acuity that is surrounded by a field of normal – or relatively well-preserved – vision. Every normal mammalian eye has a scotoma in its field of vision, usually termed its blind spot.
A new surgery can give legally blind people 20/20 vision. Rachel Reeves. ... in technology may be able to reverse blindness caused by a traumatic brain injury even to levels of perfect vision.
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 ]
B3 is a disability sport classification for people who have partial vision. [1] The International Blind Sports Federation (IBSA) defines this classification as "From visual acuity above 2/60 to visual acuity of 6/60 and/or visual field of more than 5 degrees and less than 20 degrees."
Homonymous hemianopia is a type of blindness that destroys one entire side of the visual field typically caused by injury in the primary visual cortex. Quadrantanopia is a type of blindness that destroys only a part of the visual field typically caused by partial injury in the primary visual cortex. This is very similar to homonymous hemianopia ...
The majority of studies on blindsight are conducted on patients who are hemianopic, i.e. blind in one-half of their visual field.Following the destruction of the left or right striate cortex, patients are asked to detect, localize, and discriminate amongst visual stimuli that are presented to their blind side, often in a forced-response or guessing situation, even though they may not ...