Test 189  (Ocular physiology)
1. The bright-flash ERG:
a. comes only from the cones

b. is generated in a fully dark adapted eye by the highest 
    intensity of light

c. can be used to assess the overall retinal integrity in 
    the presence of media opacity

d. is abnormal in patients with age-related macular 

e. is abnormal in optic neuritis.


2. The following cells contribute the wavefronts of the flash ERG:

a. retinal pigment epithelium

b. corneal endothelium

c. photoreceptors

d. ganglion cells

e. Müller cells


3. The parameters that are measured clinically in the flash ERG are:
a. amplitude

b. excitation time

c. implicit time

d. latency

e. Arden index

. 4. The following methods can be used to test solely the rod ERG:
a. a rapidly flickering light

b. red light stimulus

c. low-density blue light in dark adapted eye

d. focal ERG

e. pattern ERG

5. Pattern ERG (PERG):

a. tests the function of the ganglion cells

b. uses a checkeredboard pattern that changes in luminance

c. gives the same information as visual evoked response

d. is abnormal in glaucoma

e. is affected if the patient's refractive error is not 

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