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.6. (a) Define "power of accommodation of eye".(b) A person uses a lens of power -2.0D for correcting his distant vision. Forcorrecting his near vision he uses a lens of power +1.5D. What is the focal length ofthe lenses required to correct this disorder?(3M)

Answer»

a. Power of accommodationis the ability of theeyelens to focus near and far objects clearly on the retina by adjusting its focal length.Power of accommodationof theeyeis limited. It implies the focal length of theeyelens cannot be reduced beyond certain minimum limit.

P=1/f-2.0=1/ff=1/-2.0f=-0.5cm

P=+1.5DP=1/f+1.5 D=1/ff=1/1.5f=0.66cm



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