Vision impairment can broadly be classified as central vision loss, peripheral vision loss, blurred vision and vision disorders due to brain injury. The loss of central vision creates a blind spot, which makes it difficult to read, recognize faces or perform other precision tasks. However, the person may still be able to move around without assistance, as the peripheral vision is unaffected.
In peripheral vision loss, the visual field is narrowed, with an inability to distinguish anything on one side or both sides or anything directly above and/or below eye level. It severely affects the ability to move independently.
Blurry vision causes both near and far objects to appear out of focus and causes problems in reading, writing as well as in moving independently.
In most visual disturbances caused by brain injury, the ability of the brain to analyze visual information is affected.