For each of the visual terms A–E, select the most appropriate option from the following list of definitions

A. Option 3 Continuous jerky movements of the eyeballs. These can occur normally (physiological nystagmus) but are exaggerated in certain diseases affecting the cerebellum.

B. Option 1 Blindness in half of the visual field. Usually caused by a lesion in one optic tract. A lesion affecting one optic nerve causes total blindness in that eye.

C. Option 4 People who can only distinguish between two primary colours. This is one form of colour blindness; healthy people (trichromats) can distinguish between the three primary colours.

D. Option 2 Loss of central vision with normal peripheral vision. This is due to damage to the macula.

E. Option 5 Loss of peripheral vision with normal central vision. This is often seen in patients with lesions affecting the occipital (visual) cortex.