Cortical Visual Impairment (CVI)

Cortical visual impairment is reduced vision caused by the way the brain processes what the eyes see, rather than by a problem with the eyes themselves.

Common symptoms

Variable vision, difficulty recognising objects or faces, trouble with cluttered scenes or movement, and better use of vision in familiar, simple environments.

Description

Cortical visual impairment (CVI), sometimes called cerebral visual impairment, is caused by damage to or differences in the parts of the brain that process vision. The eyes themselves may be physically healthy.

CVI is a leading cause of visual impairment in children in the UK and can be associated with brain injury at birth, prematurity, infection, or other neurological conditions. Vision often varies depending on tiredness, lighting, clutter, and how familiar the surroundings are.

Assessment usually involves both eye specialists and professionals who understand how the brain processes vision. Support focuses on tailored environments, simplified visual information, and working closely with education, therapy, and family teams.