Question

what is eye and its parts
evvarina unnara​

Answer 1

The eye has many parts that must work together to produce clear vision: The sclera, or white part of the eye, protects the eyeball. The pupil, or black dot at the centre of the eye, is an opening through which light can enter the eye. The iris, or coloured part of the eye, surrounds the pupil.

Answer 2

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❝ The human eye is most important sense organ, which enables us to see the objects and colours around us. ❞

Human eye consists :

• cornea
• aqueous humour lens
• iris
• pupil
• ciliary muscles
• retina

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Cornea :

Cornea is the front position of the eye.

➠ It is convex in shape and bulges outside.

➠ Light enters the eye through the cornea.

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Aqueous humour lens :

➠ It is a viscous liquid filled in the area between the cornea and eye lens.

➠ It prevents the eye from collapsing due to changes.

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Iris :

➠ It is a dark muscular diaphragm located just behind the cornea.

➠ It regulates the amount of light entering the eye by adjusting the size of the pupil.

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Pupil :

➠ It is a hole in the middle of the iris.

➠ Size of the pupil decreases or increases depending upon the intensity of light.

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Ciliary muscles :

➠ Ciliary muscles and suspensory ligaments adjust the focal length of the eye. So that we can see distant and nearby objects clearly.

➠ The ability of the eye to focus on distant and nearby objects by changing the focal length is called accommodation.

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Retina :

It is a delicate membrane having a large number of light sensitive cells

➠ The light sensitive cells get activated upon illumination and generate electrical signals.

➠ The light sensitive cells are of two types :

1. Rods : Cells that respond to the intense of light.
2. Cones : Cells that respond to the color of objects.

➠ An inverted real image is formed on the object of retina.

➠ The electrical signals generated by the cells are sent to the brain through the optic nerve.

➠ The brain reassembles the signals into a neaniningful inverge and gives rise to the sensation.

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