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.
Canaan Barrie signs involve touching - on the body or hands - or movements close to the child.
Contrast sensitivity is an important measure of visual function, especially in situations of low light, fog or glare, when the contrast between objects and their background often is reduced.
Cortical Visual Impairment
Cortical Visual Impairment (CVI) refers to visual problems a child or adult may experience due to damage to the parts of the brain that deal with vision. CVI can be referred to as 'Cerebral Visual Impairment', 'Cognitive Visual Impairment' or 'Visual Processing Disorder'.