Question

Construction of eye in short

Answer 1

Explanation:

front part of eye is called cornea. Iris control the amount of light entering the eye.

Answer 2

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The front part of the eye is called the cornea. It is made of transparent substance and it is bulging out words .The outer surface of cornea is convex in shape .The light coming from object enters the eye through cornea. Just behind the cornea is the Iris or coloured diaphragm.Iris is a flat ,coloured ,ring-shaped membrane behind the cornea of the eye. There is a hole in the middle of the Iris which is called pupil of the eye. Thus, Pupil is a hole in the middle of the Iris .The Pupil appears black because no light is reflected from it . The eyelens is a convex lens made of a transparent ,soft and flexible material like a jelly made of proteins .Being flexible ,the eyelens can change its shape to focus on the light onto retina .The eyelens is held in position by suspensory ligaments. one end of the suspensory ligaments is attached to the eyelens and their other end is attached to the ciliary muscles .ciliary muscles change the thickness of the eyelens while focusing. in other words , the focal length of eye lens can be changed by changing its shape by the action of ciliary muscles .The screen on which the image is formed in the eye is called retina. The retina is behind the eyelens and at the back part of the eye . The retina is a delicate membrane having a large number of light sensitive cells called rods and cones which respond to the intensity of light and colour of objects respectively, by generating electrical signals. At the junction of optic nerve and retina in the eye , there is no light-sensitive cells due to which no vision is possible at that spot. This is called blind spot . Thus, blind spot is a small area of the retina insensitive to light where the optic nerve leaves the eye .The space between cornea and eyelens is filled with watery liquid called aqueous humour and the space between eyelens and retina is filled a transparent Jelly like substance called vitreous humour which supports the back of the eye .