Test 133  (Ocular physiology)
1.  Regarding visual evoked potential:
a. it is a type of electroencephalogram 

b. the latency of flash VEP correlates with visual acuity

c. the amplitude of pattern-flash VEP correlates with 
    visual acuity

d. the amplitude of VEP varies directly with the strength 
    of the stimulus

e. the wave pattern of flash VEP shows little variability 
    between individual

2. The ciliary body:

a. receives 7% of total ocular blood flow

b. contains pigmented ciliary epithelial cells that are 
    responsible for aqueous secretion

c. receives parasympathetic nerve supply via the long 
    ciliary nerves

d. contracts during accommodation

e. is the main source of anti-oxidant systems in the 
    anterior chamber

3. Phototransduction: 

a. occurs in pineal gland

b. involves the conversion of light energy into electrical 

c. involves capturing of the photons by the inner 
    membrane of the photoreceptors

d. requires a minimum of 10 photons to become activated

e. involves the isomerization of 11-cis retinal to all trans 

4. The following are associated with optic neuritis:

a. Uhthoff's phenomenon

b. Aubert's phenomenon

c. Pulfrich's phenomenon

d. Troller's phenomenon

e. Raynaud's phenomenon

5. The following are true about electroretinogram :

a. a1 wave originates in rods

b. a2 wave originates in cones

c. b wave originates in bipolar cells

d. amacrine cells generate the oscillatory potentials

e. b wave is absent in central retinal vein occlusion.

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