Question

Explain the function of human eye with diagram.

Answer 1

Eye is also the one of most important and needed organ in our human body.
Sense of sight (power to see) is rendered by our eyes. Eyes helps us to see near and distant objects nicely.We are able to see our surrounding with the help of eye. We can see different types of colors with the help of eye. Some animals can't see colors or just some selected colors can be seen by some but human eye is the one which is able to see all the colors.

Hope this helps......

Answer 2

HUMAN EYE
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eye is one of the major sensory organs in the human body. It is responsible for vision, color differentiation (the human eye can differentiate between approximately 10 million colors) and maintaining the biological clock of the human body. To understand how the eye does everything that it does, we need look into the structure of human eye.

EXTERNAL STRUCTURE OF AN EYE
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The parts of the eye that are visible externally comprise of the external structure of the eye-

• Sclera: It is a tough and thick white sheath that protects the inner parts of the eye. We know it as the ‘White of the eye’.

• Conjunctiva: It is a thin transparent membrane that is spread across the sclera. It keeps the eyes moist and clear by secreting small amounts of mucus and tears.

• Cornea: It is the transparent layer of skin that is spread over the pupil and the iris. The job of the cornea is to refract the light that enters the eyes.

• Iris: It is a pigmented layer of tissue that makes up the colored portion of the eye. It’s primary function is to control the size of the pupil, depending on the amount of light entering it.

• Pupil: It is the small opening located at the middle of the Iris. It allows light to come in.

INTERNAL STRUCTURE OF AN EYE
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The internal structure of the eye includes the following parts:

• Retina: It is the screen at the end of the eye, where all the images are formed. It is extremely sensitive to light because of the presence of Photoreceptors, which are photosensitive cells that detect dim and colored lights.

• Lens: It is a biconvex, transparent and adjustable structure that focuses light to the retina, hence forming images on it.

• Aqueous humor: It is a watery fluid that is present in the area between the lens and the cornea. It is responsible for the nourishment of both the lens and the cornea.

• Vitreous Humor: it is a transparent semi-solid, jelly-like substance that fills the interior of the eyes. Its role is that it maintains the shape of the eye and also causes refraction of light before it reaches the retina.

• Optic nerve: Located at the end of the eyes, behind the retina, the optic nerve is responsible for carrying all the nerve impulses from the photoreceptors to the brain, without which vision would not be possible..