Station eight
(allowed 5 minutes)

aa
a
A security guard with 3 D of myopia in both eyes and 1.5D of accommodative amplitude 
wants single vision glasses for viewing CCTV screen 1 m in front of him.

a. if he is fully corrected for distance, at what distance can he see comfortably using his 
    accommodative reserve (assuming that he uses one-third of his accommodative reserve)?

b. what power lenses should be given for him to see the CCTV comfortably (again assume 
    that he uses one-third of his accommodative reserve)?

a

 

 

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