Question

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

1. Blindness in half of the visual field.

2. Loss of central vision with normal

3. Continuous jerky movements of the peripheral vision. eyeballs.

4. People who can only distinguish between

5. Loss of peripheral vision with normal two primary colours. central vision.

A. Nystagmus.

B. Hemianopia.

C. Dichromats.

D. Central scotoma.

E. Macular sparing.

Answer 1

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