State the function of each of the following parts of the human eye:(i)

1.	State the function of each of the following parts of the human eye:(i) Cornea(ii) Iris(iii) Pupil(iv) RetinaMillions of people of the developing countries are suffering from cornealblindness. This disease can be cured by replacing the defective corneawith the cornea of a donated eye. Your school has organised a campaignin the school and its neighbourhood in order to create awareness aboutthis fact and motivate people to donate their eyes after death. How canyou along with your classmates contribute in this noble cause? State theobjectives of organising such campaigns in schools.
Answer» (i) The cornea acts as the eye's outermost lens. It functions like a window that controls and focuses the entry of light into the eye. The cornea contributes between 65-75 percent of the eye's total focusing power. When light strikes the cornea, it bends -- or refracts - the incoming light onto the lens. (ii) The iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. Eye color is defined by that of the iris. (iii) The whole job of pupil is to control the amount of light that gets into the eye. It's called a pupillary reflex, and you have probably noticed that a person's pupils are smaller in bright light and bigger in low light. (iv) The retina is a thin layer of tissue that lines the back of the eye on the inside. It is located near the optic nerve. The purpose of the retina is to receive light that the lens has focused, convert the light into neural signals, and send these signals on to the brain for visual recognition.

State the function of each of the following parts of the human eye:(i) Cornea(ii) Iris(iii) Pupil(iv) RetinaMillions of people of the developing countries are suffering from cornealblindness. This disease can be cured by replacing the defective corneawith the cornea of a donated eye. Your school has organised a campaignin the school and its neighbourhood in order to create awareness aboutthis fact and motivate people to donate their eyes after death. How canyou along with your classmates contribute in this noble cause? State theobjectives of organising such campaigns in schools.

Answer»

(i) The cornea acts as the eye's outermost lens. It functions like a window that controls and focuses the entry of light into the eye. The cornea contributes between 65-75 percent of the eye's total focusing power. When light strikes the cornea, it bends -- or refracts - the incoming light onto the lens.

(ii) The iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. Eye color is defined by that of the iris.

(iii) The whole job of pupil is to control the amount of light that gets into the eye. It's called a pupillary reflex, and you have probably noticed that a person's pupils are smaller in bright light and bigger in low light.

(iv) The retina is a thin layer of tissue that lines the back of the eye on the inside. It is located near the optic nerve. The purpose of the retina is to receive light that the lens has focused, convert the light into neural signals, and send these signals on to the brain for visual recognition.

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