Test 29  (ocular physiology)
1. The following are true about the lens:
a. the anterior capsule is 10 times thicker than the posterior 

b. the anterior surface has a greater radius of curvature than 
     the posterior surface

c. during accommodation the lens moves towards the cornea

d. the lens is more effective in absorbing light with long than 
    short wave-lengths

e. the lens is supplied by the ophthalmic nerve

2. The following are known to cause cataract:
a. prozac

b. simvastatin

c. salicylic acid

d. chlorpromazine



3. The following are associated with cataract formation:
a. dehydration

b. smoking

c. alcohol

d. poor nutrition

e. ultraviolet light.


4. In the lens:
a. the potassium concentration is higher than that of the 

b. the majority of the lens protein are water soluble

c. glutathione is increased in the presence of cataract

d. production of fructose is increased in the presence of 

e. the osmolarity is higher than that of the aqueous


5. The following are true about crystallins found in the lens:
a. they are water soluble

b. alpha crystallin is the most common 

c. gamma crystallin is the smallest crystallin

d. beta crystallin has the largest mass

e. gamma crystallin is found mainly in the nucleus


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