Question

what is presbyopia ?????????

Answer 1

Heya
Here is your answer
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A person suffering from both Myopia (near sightedness) and hypermetropia (far sightedness) is said to be suffering from PRESBYOPIA

This can be corrected by BI FOCAL lens in which upper part is concave and power is convex
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Hope this helps ❤

Answer 2

Answer:

$\large{\underline{\mathfrak{\red{Presbyopia\:\::-}}}}$

• It is the defect of vision due to which an old age person cannot see nearby objects clearly due to loss of power of accomodation of eye.

• The near point of the old person having presbyopia gradually recedes and becomes much more than 25 cm away.

$\large{\underline{\mathfrak{\blue{Causes\:\:of\:\: Presbyopia\:\:\::-}}}}$

• Gradual weakening of ciliary muscles.

• Diminishing flexibility of eye lens.

$\large{\underline{\mathfrak{\green{Correction\:\:of\:\: presbyopia\:\::-}}}}$

• Use of convex lens of suitable power.

• Sometimes a person may suffer from both myopia and hypermetropia.

• Such people require bifocal lens for correction.