Question

defects in human eye?​

Answer 1

HEY MATE HERE IS YOUR ANSWER:-

Defects of the eye:

Myopia: (nearsightedness) This is a defect of vision in which far objects appear blurred but near objects are seen clearly. ...

Hyperopia: (farsightedness) This is a defect of vision in which there is difficulty with near vision but far objects can be seen easily.



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Answer 2

$\textbf{De}\textbf{fect in human eye}$

Sometimes the eyes of a person cannot focus the image of an object on the retina properly . In these cases the vision of the person becomes blurred and he cannot see either the distant object or nearby object clearly and comfortably. The person is said to have a defects of vision all defects of eyes.

$\textsf{There are three de}\textbf{fects of eyes , these are : }$

$\text{1. Myopia }$

$\text{2. Hypermetropia }$

$\text{3. Presbyopia }$

$\textsf {\underline{1. Myopia \: (short - sightedness) }}$

Myopia is that defect of eyes in which a person is able to see nearby objects but not able to see distant objects clearly.

$\text{Myopia is caused \: by : }$

(1). Due to high converging power of lens.

(2). Due to eye ball being too long.

♦ Myopia is corrected by using spectacles containing concave lenses.

♦ The far point of a myopic eye is less than infinity.

$\textsf {\underline{2. Hypermetropia \: (long sightedness) }}$

Hypermetropia is that defect of eyes in which a person is able to see distant objects but not able to see nearby objects clearly.

$\text{Hypermetropia is caused \: by : }$

(1). Due to low converging power of lens.

(2). Due to eye ball being too short.

♦ Hypermetropia is corrected by using spectacles containing convex lenses

♦ The near point of a hypermetropic eye is more than 25 centimetres away.

$\textsf {\underline{3. Presbyopia }}$

Presbyopia is that with defect of eye due to which an old person cannot see the nearby objects clearly due to lost of power of accommodation of the eye.

♦ Presbyopia is a special kind of hypermetropia, we can call it old age hypermetropia.

$\text{Presbyopia is caused \: by : }$

(1). The Loss of the power of accommodation of eye due to old age.

♦ Presbyopia defect is corrected by using spectacles having convex lens, same as hypermetropia.

♦ The near point of a hypermetropic eye is more than 25 centimetres away, same as hypermetropia.