Question

being fact that presbyopia and hypermetropia are the two defects of eye vision but there are some points which differentiate both the defects of the vision from each other .what are those points​

Answer 1

Answer:

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the main difference is given below.

presbyopia

in this situation the power of accommodation of the eye usually decreases with aging for most people the near point gradually recedes away. so this defect is called presbyopia, it arises due to the gradual beginning of the ciliary muscles and diminishing flexibility of the eye lens. sometimes a person may suffer from both myopia and hypermetropia such person of and require bifocal lenses

hypermetropia

it also known as far sightedness. A person with hypermetropia can see distant objects clearly but cannot see nearby objects.

this defect arises either because the focal length of the eye lens is too long or the eyeball has become too small.