Test 33
1. The following are true about presbyopia:
a. it tends to occur earlier in myopia than hypermetropia

b. it tends to occur earlier in uncorrected than corrected 
    hypermetropia

c. it tends to occur earlier in the tropics than in temperate 
    countries

d. it occurs in patients whose amplitude of 
    accommodation is less than 4 D

e. in order for an emmetrope with a remaining amplitude 
   of accommodation of 3 D to read clearly at 25cm, the 
   appropriate glassed should be 2 D

 


2. The following are true about intraocular lens implant:

a. a forward movement of the implant will make the eye 
    more hypermetropic

b. a forward movement of the implant will increase the 
    effectivity of the lens 

c. the implant is displaced inferiorly if there is inferior 
    zonulysis

d. PMMA cannot be used to make foldable lens

e. PMMA lens is thicker than silicone lens for the same 
    refractive correction

 


 
 
3. With regard to hydrogel intraocular lens:
 
a. it has the same refractive index as silicone

b. it can be used to make foldable lens

c. it increases in size with hydration

d. it is more susceptible to damage from YAG laser 
    than PMMA lens

e. it can be sterilized using heat

 
 
. 4. Regarding anti-reflection coatings on the glasses:
a. it is made up of a thin film of crystalline substances

b. it works by constructive interference of reflected lights

c. coating can be applied to either the anterior or 
    posterior surface only

d. wavelengths at the ends of the visible spectrum are 
    only partly reflected 

e. it can be achieved by dipping process


5. With regard to contact lens:

a. when changing from glasses to contact lenses, 
    the myope need a weaker lens

b. when changing from glasses to contact lenses, 
    the hypermetrope needs a stronger lens

c. the near point of accommodation is reduced in 
    a myope wearing contact lens

d. the near point of accommodation is increased in
    a hypermetrope wearing contact lens

e. contact lens increases the field of vision compared
    to glasses.

 
 
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