Visual Impairment Glossary

Vision impairment and blindness, its causes, and assistive resources come with a huge range of terminology. Browse our glossary to learn the meanings of these terms. 

Fingers type on a BrailleNote touch
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A free image and photo editing software programme. This programme can be used to produce visually textured images which can be turned into tactile diagrams.

Peripheral Vision

All that is visible to the eye outside the central area of focus; side vision.


Perkins School for the Blind, in Watertown, Massachusetts, is the oldest school for the blind in the United States. It has also been known as the Perkins Institution for the Blind.
Perkins manufactures its own Perkins brailler and braille teaching tool, the Perkins SMART BraillerĀ®.

Perkins Brailler

A "braille typewriter" with 6 keys corresponding to the dots of the braille code, a space key, a backspace key, and a line space key. It is used for producing documents in braille.

Pre-braille Skills

These are skills designed to increase tactual awareness and perception in individuals who will learn to read and write braille in the future.