Test 56  (Ocular physiology)
1. The Pulfrich phenomenon:
a. occurs in patients with bilateral macular degeneration

b. occurs in optic neuritis

c. refers to the perception of photopsia 

d. refers to the illusion of abnormal motion

e. can occur with a swinging pendulum

2. The following are true about the contrast sensitivity:

a. Pelli-Robson chart tests the contrast sensitivity

b. is a measure of the ratio of brightness to darkness

c. a contrast of 1 means that there is no contrast

d. is highest at middle range frequencies

e. is reduced in macular degeneration but not in cataract


3. The following are true:
a. depth of perception only occurs in patients with 
    normal visual acuities in both eye

b. Hering's law states that increased innervation to an 
    extraocular muscle is accompanied by a decrease 
    in innervation to its antagonists. 

c. objects on the Panum's area fall on simultaneous 
    areas of the retina

d. objects outside of the Panum's area are perceived as 

e. objects on the horopter are seen as single

4. The following are yoke muscles:

a. right medial rectus and left lateral rectus

b. right inferior rectus and left superior rectus

c. right superior rectus and left inferior oblique

d. right superior oblique and left inferior rectus

e. right inferior rectus and left inferior oblique

5. The following are true about fluorescein sodium:

a. it is 60% bound to the plasma protein

b. it  leaks out of the choriocapillaris readily

c. is excreted mainly by the kidney

d. it is excited by green light

e. it has a emission peak of 530nm

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