Question

Describe the structure of eye with neat digram

Answer 1

The eye is one of the major sensory organs in the human body.The eye structure can be broadly classified as External structure and Internal structure.

External structure of 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 eye

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.

Answer 2

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Each eye consists of an eyeball which is beated on the hollow cavity of skull called Orbit.The eyeball is filled with fluid which protects the eyes from shocks.The Eyelids and eyelashes protects the eyes from the dust.The circular portion in front of the eye is called the pupil.Retina is present at the back of the eye where image is formed.Optic nerve connects the eyes to brain.

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