Visual Fields

Question 1

What is the visual field pathway and its defects?

Answer 1

Question 2

What is the pupillary reflex?

Answer 2

Question 3

Which two nerves are involved in the pupillary reflex?

Answer 3

CNII - Optic - This detects light and causes a direct response in the same eye and a consensual response in the opposite eye. The response is carried out by:

CNIII - Occulomotor

Question 4

What happens to the pupillary reflex when one optic nerve is damaged?

Answer 4

When light is shined into the damaged one there will be no response on either side.

However, that eye will show a response when light is shone in the other eye.

Question 5

What happens to the pupillary reflex when one occulomotor nerve is damaged?

Answer 5

There will be no repsonse in the damaged eye when light is shone into either eye.

There will be a repsonse in the other eye from light in either eye

Question 6

What is a RAPD?

Answer 6

Marked - No response in either eye

Mild - The eye appears to dilate in the damaged eye showing a damaged optic nerve in that eye

Question 7

What is Horners syndrome?

Answer 7

SNS damage to one eye so the eye stays small

Question 8

What a CNIII palsy look like?

Answer 8

The eye is down and out and pupil doesn’t constrict

Question 9

What three things happen in a pupillary near response?

Answer 9

1. Convergence of pupils via MR (CNIII)
2. Lens thickens to focus light
3. Constriction of pupils via iris sphincter (CNIII)

Question 10

Which tract does Meyers loop refer to?

Answer 10

Temporal optic radiation, so upper vision

Question 11

What is the terminology for half/quarter vision loss?

Answer 11

Hemianopia

Quadrantanopia