The Human Eye

The eye as we all know is the one of the most important sense organ in our body. Thus knowing about it is always a pleasure. Therefore I take the opportunity to explain the structure and working of the eye in relation and not in relation to the brain.

The old saying that 'seeing is believing' defines the importance of sight which is provided by the eyes. The are located in two sockets of the skull. The eyeball is about one inch across and has muscles at the back which allow it to move up and down.

Outer protection to the eye is provided by a thin layer of skin called the eyelid and the hair at the end of eyelids are called eyelashes to prevent dust and other microorganisms to go into the eye. Tear glands located just above the eyes produce moisture and as we blink our eyes they get cleaned. The eyeball is padded with a layer of fat and on front ahas a hole called Pupil,this is surrounded by the Iris which makes the pupil smaller or bigger depending on the light outside. Located on the front of the eyeball is the cornea which is more like a transparent window, allowing partially focused light rays to enter the eye. Behind the cornea is a lens which focuses the light so that a fully focused but inverted image is formed on the Retina.

Located at the back the retina is made up of many rods and cones. The cones are sensitive to different colors while the rods are sensitive only to black and white, these rods and cones produce nerve signals when light reaches them through cornea. The inside of the eye contains a vitreous fluid which contains blood vessels for nourishing the eye. The retina is connected at the back to an optic nerve which inverts the image, right side up, while conveying the signals to the brain. Thus an upright image is formed by the brain giving us proper sight. The eyes work together duly controlled by the brain thus allowing us 'BINOCULAR VISION'.

This was the working of the human eye. Please relate the text to the diagram. I hope I have provided you with the adequate information you needed.

If yes please comment.

Thanking you,

Ishaan.

P.S Please click the diagram to view it fully.