a. photokeratitis occurs with wavelength of 270nm

b. microvilli are found in the outer layer of the epithelium

c. the turnover of the corneal epithelium typically takes 30 days

d. the corneal epithelium is about 10 layers in thickness

e. the corneal nerves do not contain schwann cells

Answera.T   b.T   c.F   d.F   e.F
The epithelium layer is typically about 5-layer thick. 
The turnover of the corneal epithelium is about 7 days.
Schwann cells are found around the neurones but they do not produce myelin in the cornea.

2. True statements about the aqueous include:

a. the production is about 2 ul/min

b. the endothelium contribute to the production of aqueous

c. its production decreases with age

d. it has the same osmolarity as the plasma

e. the uveoscleral outflow is an active process

Answera.T   b.T   c.T   d.T   e.F
The endothelium pumps fluid out of the cornea and therefore contribute to the production of the aqueous.
The uveoscleral outflow is not an active process.

3. The following conditions can affect the pupil size:

a. iris colour

b. fatigue

c. exercise

d. refractive error

e. axial length of the eyeball

Answera.T   b.T   c.T   d.F   e.F
The pupil size can be affected by the iris colour: a blue iris is associated with a larger pupil than a brown iris. 
The autonomic system also affects the pupil size. Fatigue is associated with a decreased sympathetic tone and therefore smaller pupil. Whereas exercise increases the sympathetic tone and therefore a larger pupil.
The refractive error and the axial length of the eyeball do not appear to affect the pupil size.

4. In Argyll-Robertson's pupils:

a. the pupils are irregular

b. iris atrophy are common

c. there are absent tendon reflexes

d. the lesion is in the mid-brain

e. the pupils react poorly to atropine

Answera.T   b.T   c.T   d.T   e.T

5. The following are true about the pupils:

a. pupil size is largest in adolescence

b. physiological anisocoria is found in 20% of the population

c. the latent period of the pupil reaction to light ranges from 
    0.2 to 0.5s

d. afferent pupil defect is present in complete third nerve palsy

e. efferent pupil defect is present in Adie's pupil

Answera.T   b.T   c.T   d.F   e.T
The latent period of the pupil reaction to light varies with the light intensity. In strong light it is about 0.2s and in dim light 0.5s. 
Efferent pupil defect is present in both Adie's pupil and complete third nerve palsy.