Magnification System A combination of optical and electronic means to enlarge print.

Magnification System A combination of optical and electronic means to enlarge print.

Computer software controlled by the user to enlarge and increase contrast of letters on the computer screen

In simple terms, these electronic machines examine a piece of paper bit by tiny bit and determine whether that bit contains a color or white space. In a matter of seconds, the machine feeds a composite digital picture of the page to the host computer that can be displayed and manipulated in helpful ways. In […]

This stands for Rich Text Format, a file format developed by Microsoft. This format was developed to enable documents to be transferred between application programs. Rich Text Format Files have the file extension .rtf. Most word processors can process Rich Text Format files.

Any one of a large group of inherited disorders in which abnormalities of the photoreceptors (the rods and cones) in the retina lead to progressive visual loss. People with retinitis pigmentosa (RP) first experience defective adaptation to the dark (“night blindness”), then narrowing of the visual field (“tunnel vision”) and eventually loss of central vision. […]

An experimental process that implants various sorts of electronic chips either in front of or behind the retina. Some human experiments are now being conducted.

The retina is the light-sensitive layer of tissue that lines the inside of the eye and sends visual messages through the optic nerve to the brain. When the retina detaches, it is lifted or pulled from its normal position. If not promptly treated, retinal detachment can cause permanent vision loss. Symptoms include a sudden or […]

Of or pertaining to the retina.

The light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve.