Test 17
1. Charts used for testing contrast sensitivity include: 
a. Snellen's chart 

b. Logmar 

c. Vistech 

d. Bailey Hi-Lo 

e. Pelli-Robson 

2. The following are true: 
a. measurement of strabismic deviation in the presence of 
    high-plus spectacle underestimate the deviation 

b. measurement of strabismic deviation in the presence of 
    high-minus spectacle overestimate the deviation 

c. a high-plus lens provide a base-in prism in exotropia 

d. a high-plus lens provide a base-out prism in esotropia 

e. strabismus is exaggerated cosmetically if the patient wears a 
    high-plus spectacle. 


3. Combined astigmatic keratotomy and cataract surgery is useful in the 
    following situation: 
a. keratometry:                  44.25/ 46.00 @ 90 
    cycloplegic refraction:    -2.00/-1.75 X 175 

b. keratometry:                  42.00/45.25 @ 10 
    cycloplegic refraction:    +2.00/+2.50 X 15 

c. keratometry:                  43.00/43.75 @45 
    cycloplegic refraction:    -2.00/+2.00 X35 

d. keratometry:                  44.00/44.25@10 
    cycloplegic refraction:    -1.75/-1.75 X 100 

e. keratometry:                   42.00/45.00@100 
    cycloplegic refraction:     +3.00/-0.50X 90 


4. The following will give rise to with the rule astigmatism following 
    cataract surgery: 
a. a tight corneal suture at 900

b. preoperative keratometry result of 42.00/44.75@80 and 
    a preoperative refraction of -1.00/-2.00X170. 

c. tilting of the implant along its horizontal axis 

d. tilting of the implant along its vertical axis. 

e. loose suture following temporal extract capsular cataract 

5. The following visual fields does not meet driving criteria in the UK: 
a. a dense right scotoma 

b. bitemporal hemianopia 

c. bilateral altitudinal field defect 

d. homonymous hemianopia 

e. peripheral ring scotoma 

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