Question

an old person find it difficult to see nearby objects clearly and distinctly without corrective eye glasses a) what defect of vision is this b)two causes for development of this defect c) how is the eye defect of old person differing from near sightedness and far sightedness

Answer 1

(a):- Presbiopia.(b)Due to growing age. or weakness of ciliary muscle.and (c) In this old person not able to distinguish between the horizontal and vertically.

Answer 2

a) presbiopia
b) weak action of ciliary muscles .
abnormal shape of cornea.
c) The person suffering from near sightedness cannot see nearby objects whereas the person suffering from far sightedness cannot see far objects but this person cannot see both properly.