A measurement of visual acuity (or clearness of sight) that most eye care professionals consider as the mean. The level of acuity is routinely measured by requiring an individual to identify various s [..]

AMD is an acronym for Age-related Macular Degeneration, characterized by a worsening loss of central vision as a result of deterioration of the macula

A black-lined grid on a white background, used for testing central sight field distortion and impairments that signal macular degeneration and other vision loss issues. See a graphic representation of [..]

the clear fluid contained between the iris and cornea that provides necessary nutrients to the lens and cornea. When this fluid cannot drain, it creates unrelieved pressure that can result in Glaucoma [..]

An eye disorder caused by uneven curvature of the eyeball that motivates light rays to bend, targeting more than one point of the retina, instead of a single spot. This causes blurry vision, vague sha [..]

A condition that causes involuntary blinking to an excessive measure that the affected individual cannot see. Blepharospasm is considered as a form of functional blindness.

A tactile reading and writing system invented by Louis Braille in the 1820s and widely used by the blind and deaf-blind. Braille is made up of a system of raised dots that are felt with the fingertips [..]

A tactile device consisting of a row of rectangular cells, each of which contains a series of moveable pins. The pins are controlled electronically to move up or down to form Braille characters. The c [..]

Commonly caused by aging in conjunction with diabetes, excessive exposure to UV rays, and sometimes caused by smoking and excessive steroid use, cataracts result in clouding or yellowing of the eye le [..]

an older term for a video camera system that broadcasts a signal to a specific monitor (as opposed to a public broadcast source). The more common term for use for people with low vision is video magni [..]