Vision 2

Question 1

What is visual field?

Answer 1

Everything you can see with one eye

Question 2

which are medial/ which are lateral between temporal and nasal fibres?

Answer 2

Nasal are medial

Temporal are lateral

Question 3

What is the pathway of optic fibres?

Answer 3

These fibres are transmitted from the eye along the optic nerve to the optic chiasma
At the Optic chiasma the nasal fibres cross over, The temporal fibres do not.
These fibres move into the optic tract

The optic tract contains temporal fibres from the ipsilateral eye and nasal fibres from the contralateral eye

The optic tract synapse at the LGB of the thalamus
Here optic radiation passes from the internal capsule to reach the primary visual cortex in the occipital lobe.

Question 4

Why does the right visual cortex see the left visual field?

Answer 4

The optic tract contains temporal fibres from the ipsilateral eye and nasal fibres from the contralateral eye SO from the OPPOSITE visual field.
This explains why the right visual cortex sees the left visual field.

Question 5

Right/left eye blindness?

Answer 5

Right/Left optic nerve is damaged

Question 6

Bitemporal hemianopia

Answer 6

Optic chiasma is cut in the middle

Question 7

Contralateral homonymous hemianopia

Answer 7

Optic tract is damaged