Human Eye – Working of the Eye

Human Eye – Working of the Eye

Human Eye is a natural optical device and acts as a natural camera. As we about Human Eye, so we discuss about the “Human Eye – Working of the Eye” ans some importance of the Human Eye.

Human Eye – Working of the Eye

A human eye is a natural optical device and acts as a natural camera. It has convex eye lens which forms real, inverted & diminished image at the retina. A normal eye can see clearly an object if it is at a distance more than 25 cm called least distinct vision.

MAIN PARTS OF AN EYE

  • Cornea
  • Iris
  • Lens
  • Ciliary Muscles
  • Retina
  • Optic nerve

Working of the Eye

When we look towards an object. light from the object enters the pupil of the falls on the eye lens. The eye lens (i.e. Convex Lens) forms a real and inverted image on the retina of the eye. The retina of the eye contains special cell in the shape of rods and cones. These cells convert light energy into electrical signals. These electrical signals are carried to the brain through optic nerves. The brain finally interprets the signal and hence we see the object.

NOTE: There is the common defects of the eye, and some reasons to cause them.

COMMON DEFECTS OF EYE

1. Myopia

2. Hypermyopia

3. Presbyopia

4. Astigmatism

These are the cause/defects of the eye. and some briefly explained it.

MYOPIA (Short sightedness) :

A human eye suffered from myopia cannot see far off object or distant objects clearly but can see the near objects clearly.

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Causes of Myopia : This defect arises due to either.

(i) Elongation of the eye ball.

(ii) The excessive curvature of the cornea.

HYPERMYOPIA (Long sightedness) :

A human eye suffered from hypermyopia can see far off object or distant objects clearly but can not see the near objects clearly.

Causes of Hypermyopia : This defect arises due to either

(i) Increase in the focal length of the eye lens.

(ii) Decrease in the size of the eye ball.

PRESBYOPIA :

A human eye which cannot see the near objects as well as far off (or distant) objects clearly is said to suffer from a defect known as presbyopia.

Cause of Presbyopia : This defect arises due to the ageing of a person. The cilliary muscles are weakened and the flexibility of the crystalline lens of the Human eye decreases with the age of the person.

ASTIGMATISM :

A human eye which cannot see both horizontally and vertically lines of an object simultaneously with the same clarity is suffering from such type of defect.

Cause of Astigmatisn : This defect arises due to non spherical shape of the cornea.

This is the reasons of the Human Eye and some cause of the Defects of the Eye. You will get the Knowledge of “Human Eye – Working of the Eye”, if you have any query and question regarding to the article, fell free to comment on the Down below.

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