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.
A general term, including both total loss (Blindness) and partial loss (Low Vision), characterized either on the basis of visual impairment or by a loss of functional vision.
Visual acuity is a measure of the clarity of your central vision and the ability to distinguish shapes and details of objects. Distant vision is tested with a chart with differently sized letters read from a distance of six metres away. This is called the Snellen's Test Types.
This is the range within which objects are visible to still eyes it is also called field of vision.
Visual Field Loss
Visual Field Loss happens when damage occurs to any part of the visual pathway.
A person is said to be visually impaired when their eyesight cannot be corrected to a “normal level”. It may be said that visual impairment is the functional limitation of the eye or eyes or the vision system.