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 […]

The definition for most legal purposes in the United State is 20/200 vision with correction in the best eye, or field of vision less than 20 degrees.

The Louis Database is officially the Accessible Materials and APH File Repository. It contains information about thousands of titles of accessible materials, including braille, large print, sound recordings, and computer files from over 170 agencies throughout the United States. You can access LOUIS through the APH web site or by phone (800-223-1829) or email to: […]

Louis Braille was the inventor of braille. As a child, he became blind due to an accident. As he grew and matured, he desired a written form of communication that would serve him as well as print for his friends and family.