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)?