Test 34
1. Regarding tilting of the intraocular lens:
a. it occurs more commonly in capsulotomy than 

b. with-the-rule astigmatism occurs when the lens rotates 
    around its vertical axis.

c. biconvex lens design is least affected by lens tilt

d. meniscus lens design is most affected by lens tilt

e. it can be detected by comparing the corneal 
    astigmatism with the refractive astigmatism

2. The following are features of congenital ptosis due to dystrophic 
    levator muscle:

a. movement of the lid with jaw movement

b. failure of the involved eye to elevate

c. a high skin crease

d. failure of the lid to lower with downgaze

e. lagging of the eyelid during downgaze

3. The following lasers work by disrupting the molecular bondings:

a. YAG laser
b. argon laser
c. diode laser
d. excimer laser
e. carbon dioxide laser

4. With regard to A-scan ultrasound:

a. it has a frequency above 2 kilohertz.

b. in a phakic eye, a good A-scan will give three tall 

c. ultrasound travels faster through a cataractous eye than 
    an aphakic eye

d. the true optical axial length is greater than the distance 
    to the ultrasound spike measured from the retinal 

e. ultrasound travels slower in the silicone oil than in 

5.  The following are true about atropine:

a. it is a muscarinic cholinergic antagonist.

b. the onset of cycloplegia usually precedes that of

c. its mydriatic effect usually lasts longer than its
    cycloplegic effect.

d. its mydriatic effect can be readily reversed with topical

e. in a hypermetropic patient, topical atropine will give a 
    final refraction which is more plus than one without
    topical atropine.

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