Visual impairment is the functional loss of vision. According to the National Dissemination Center for Children with Disabilities, "the terms partially sighted, low vision, legally blind, and totally blind are used in the educational context to describe students with visual impairments. They are defined as follows: Vision can refer to: Visual perception is one of the senses. ...

1. Partially sighted indicates some type of visual problem has resulted in a need for special education;
2. Low vision generally refers to a severe visual impairment, not necessarily limited to distance vision. Low vision applies to all individuals with sight who are unable to read the newspaper at a normal viewing distance, even with the aid of eyeglasses or contact lenses. They use a combination of vision and other senses to learn, although they may require adaptations in lighting or the size of print, and, sometimes, braille;
3. Legally blind indicates that a person has less than 20/200 vision in the better eye or a very limited field of vision (20 degrees at its widest point); and
4. Totally blind students learn via braille or other non-visual media.

Visual impairment is the consequence of a functional loss of vision, rather than the eye disorder itself. Eye disorders which can lead to visual impairments can include retinal degeneration, albinism, cataracts, glaucoma, muscular problems that result in visual disturbances, corneal disorders, diabetic retinopathy, congenital disorders, and infection." Blind can refer to: The state of blindness, being unable to see A window blind, a covering for a window A hide used to conceal the observer when watching or hunting birds or other animals is sometimes called a hunting blind A blind bet in certain forms of poker A... Human eye cross-sectional view. ... Jump to: navigation, search Albinism (from Latin albus, meaning white) is a lack of pigmentation in the eyes, skin and hair. ... Cataract is also used to mean a waterfall or where the flow of a river changes dramatically. ... Jump to: navigation, search The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber and provides most of an eyes optical power [1]. Together with the lens, the cornea refracts light and consequently helps the eye to focus. ... Diabetic retinopathy is retinopathy (damage to the retina) caused by complications of diabetes mellitus, which could eventually lead to blindness. ... A congenital disorder is a medical condition that is present at birth. ... An infection is the detrimental colonization of a host organism by a foreign species. ...

See also

• Marla Runyan

Marla Runyan is a marathon runner who is legally blind. ...

External links

• Information on many topics pertaining to parenting and teaching a child with visual impairments
• Visual impairment during migraine