A refractive abnormality of the eye requiring a minus (negative or concave) lens for correction. Synonyms: near sighted or short sighted. People who are near sighted can see objects up close or at near distances without glasses.

This complex lossy compression technology for audio format was developed by Dr. Karlheinz Brandenburg in the late 1980s as a part of his doctoral thesis. MP3 stands for MPEG-1 Layer III audio format. It is used for compressing sound into a file that is a fraction of the size of the original. It allows one […]

MegaDots is a word processor software program that runs in DOS but can run under Windows. This can be used for both print and braille documents. One can translate a document to braille, edit it and print in either form. There are also such features as find-and-replace, a spell-checker, settings for contracted braille and non-contracted […]

A system of inserted codes defining layout and characteristics of mathematical formuli and text. It is an advanced variation of HTML and XML.

Graphing, curve fitting and calculating equations, inequalities and tables, and images produced in tactile graphics.

This is the language computer programmers use to mark up text and media. There are several mark up languages, depending on the use. HTML stands for Hypertext Markup Language and is used for information to be accessed by a Web browser. SGML is Standard Generalized Markup Language, a language for describing markup languages, particularly those […]

A conventionalized representation, usually on a plane surface, of spatial phenomena on a plane surface. Maps are selective and prepared to show various quantitative and qualitative facts, including boundaries, physical features, patterns, and distribution. Maps may also represent such comparative data as climates, birth and death rates, amount of income and population density. Tactile versions […]

A strictly optical approach to enlarging print.

A combination of optical and electronic means to enlarge print.

The most common cause of vision loss in those aged 55 or more, this incurable disease affects millions of people in the United States alone and is the leading cause of loss of independence. Macular degeneration is caused by the deterioration of the central portion of the retina, the inside back layer of the eye […]