Opt. Lec 2a - Visual Pathway

Question 1

Which nerve fibres partially deccusate?

A. Only nerve fibres from the temporal retina
B. Only nerve fibres from the nasal retina
C. Both
D. None of the above

Answer 1

B

Question 2

What affects to the visual field does this damage cause?:

Impulses from the lower half of the retina that loop into the temporal lobe of the brain

Answer 2

Homonymous superior quandrantopia

Question 3

What affects to the visual field does this damage cause?:

Impulses from the upper part of the retina pass into the anterior parietal part of the brain

Answer 3

Homonymous inferior quandrantopia

Question 4

What affects to the visual field does this damage cause?:

All fibres eventually reach the main parietal radiation

Answer 4

Complete homonymous hemianopia

Question 5

What affects to the visual field does this damage cause?:

Fibres carrying impulses from macula

(Terminate posteriorly)

Answer 5

Homonymous central hemianopia

Question 6

What affects to the visual field does this damage cause?:

Fibres carrying impulses from peripheral retina

(Terminate anteriorally)

Answer 6

Damage here causes macular-sparing homonymous central hemianopia

Question 7

Damage to the optic radiations cause all EXCEPT:

A. Bilateral visual field defects
B. Quntrantanopia
C. Hemianopia
D. Homonymous visual field defects 
E. Disrupted pupil light reflexes

Answer 7

E - damage to the optic radiation leaves the pupil responses intact