Test 76    (Ocular physiology)
1. The vitreous gel:
a. contains 98% water
b. is made up of 0.1% hyaluronic acid
c. is acellular
d. contains mainly type II and type III collagen
e. has a refractive index of 1.00

2. The following are true about electroretinogram (ERG):

a. the a-wave has negative deflection
b. a wave is generated by the retinal pigment epithelium
c. amacrine cells are responsible for the oscillatory 
d. it is possible to separate the cone and rod ERG
e. the ERG is flat in central retinal artery occlusion

3. With regard to pattern electroretinogram:

a. it can be used to estimate the visual acuity
b. it is generated by the occipital cortex
c. it is reduced in optic nerve diseases
d. the signal amplitude is about 10 mV
e. the pattern reversal is 1-2 Hz

4. The intraocular pressure:

a. shows a higher diurnal variation in glaucoma patients
b. is highest in the morning
c. gives a falsely higher reading in patients with thick 
d. is overestimated if measured with non-contact 
e. is underestimated in high myopia if measured by the
    indentation method.

5. The following are true about the cornea:

a. the stroma contains collagen fibrils of regular thickness
b. the Bowman's layer contains randomly arranged 
    collagen fibrils
c. the Bowman's layer is the basement layer of the
d. type I collagen is the main type of collagen found in the
e. the cornea derives most of its nutrients from the tear 

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