Anatomy of the Eye

Eye-Anatomy

People use eyes to do most of the things in their daily lives. They are the body parts that steer us to all the places that we want to go. It is little wonder that blindness is extremely feared.

The light that objects give is detected by the eyes so that their shapes and color can easily be seen. The eye has the capacity to convert the rays of light into electrical signals which are then sent to the brain. The brain understands these signals as visual images.

Inside the skull there is a hollow socket or orbit which has a protective cavity surrounded by soft fatty tissue makes it easy for the one inch diameter eye to rotate.There are basically six muscles in total that adjusts the movements of the eye. Below are some of the most important parts of the eye.

Cornea
When light enters the eye, the cornea provides most of the focusing that the eye needs. It is for this reason that it is called the ‘window of the eye’. There are five layers that make up the cornea the outermost one being called the epithelium which is made up of very regenerative materials that allow fast healing. There are two strong inner layers that provide the cornea with its basic structure in terms of strength, shape and structural stability. The two last layers help in keeping fluids out of the cornea thus amplifying its clarity. LASIK eye correction concentrates on working on this part of the eye when correcting the eye vision.

Lens
This is that clear structure that is found directly behind the iris and which is very important when clarity of near vision is concerned. The lens can become thicker or thinner depending on the need for clarity. As age sets in (between 40 and 50 years), the lens becomes less agile and Presbyopia becomes imminent. As you age further cataract forms preventing light from entering the eye.

Pupil
This is that center hole in the iris and controls light. If you are in a bright environment, the pupil becomes smaller thus reducing the amount of light entering the eye. The opposite happens when you are in a dark place.

Iris
The iris is the one that controls the colors of the eye. It controls the size of the pupil by constricting and expansion.

Vitreous body
This is the viscous liquid that is clear and which is found behind the cavity.

Retina
Retina is found on the inside wall of the eye and is lined with nerves. The retina is oftentimes compared to a camera. It is the retina that transmits images to the brain.

Optical nerve
This is the channel through which the electrical images are carried from the retina to the brain.

Sclera
This is the whitish part of the eye. It protects the eye and gives it the general round structure.

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