How the Eye works?

Labeled Human Eye Diagram

The human eye is the very important organ as it gives the sense of sight to see the world around us. It detects bright light or dim light but it cannot sense the object in the absence of light. What we see is called the light.

Light passes through the cornea, pupil and lens before hitting the retina.

PARTS OF THE EYE

The outer part called cornea is the clear bulging surface in front of the eye.

The sclera is the white part of the eye.

The iris is the colorful part of the eye. It decides the amount of light passes through the pupil and thus controls the size of the pupil.

The pupil is the black circle in the center of the iris. The pupils will get smaller when the light shines near them and they'll open wider when the light is gone.

The vitreous body is the biggest part of the eye and is also responsible for the shape of the eye.

The lens, an inner part of the eye lies behind the iris. It focuses light onto the retina and changes shape to make the fine adjustments needed to produce a sharp image. This is called accommodation. As we get older, accommodation becomes slower and weaker.

The retina lies in the back of the eye. It is made up of special cells called 'rods' and 'cones' .

Rods can 'see' black and white. Cones can 'see' colors. With both combined, we can see the whole picture.

The optic nerve is located in the back of the eye and it helps to connect the eye to the brain.

How the Eyes work?

When the image hits the retina, it changes the object upside down and convert them into an electrical message for the brain.

Then, the optic nerve carries those messages from the eye to the brain. Our each eye sees the object differently as two objects. Fortunately, our brain merges the objects which we see in our both eyes into one. The optic nerve serves as a messenger connecting the eye to the brain. Finally, our brain understands what we are seeing "cat," "apple," or "bicycle," or whatever the case may be.

All the parts of our eyes are extremely delicate. We should take good care of our eyes to protect our eyesight.

Comments

What is Glaucoma?

Glaucoma is a condition of high pressure within the eyeball causing gradual loss of sight. According to the World Health Organization, Glaucoma is considered as the second leading cause of blindness (behind cataracts)in the global level . In simple words, Glaucoma is a complicated eye disease caused by high eye pressure, and if left untreated causes permanent vision loss or blindness.It is called the “Sneak Thief of Sight” or “Silent Thief of Sight”. How the Eye works? Eyes The eye works very much like an old-style camera. In the camera, the light comes in through the shutter, is focused by the lens, falls onto the film and them we take it to be processed. In the eye, light comes in through the cornea and pupil. It is focused by the lens, falling onto the film in the eye (the retina) and then goes, via the optic nerve (the nerve of sight), to the brain (the processor) for developing. The shape of the eye is achieved through the circulation of a clear fluid (aqueous

Facts about the Eye

1.The study of eye is called Ophthalmology. 2.The tears in the eyes are produced by the lacrimal glands. 3.Watching television in total darkness is not a good idea - your eye constantly has to shift focus to follow the images, and the contrast between the bright screen and the dark room may cause eye strain. 4.The optician is a person who sells and fits eyeglasses, sunglasses, and specialty eye wear accordingly to the ophthalmologist's prescription. 5.The color of the eyes is determined by the iris. 6.The different color shades of the human eye are green,blue,yellow,brown,grey etc 7.Some people are born with eyes of two different colors, a condition known as heterochromia. 8.The human eye is about 2.5 cm in length and weighs about 7 grams. 9.The eye is about as big as a ping-pong ball and sits in a little hollow area (the eye socket) in the skull. 10.The human eye has more than a million, light-sensitive cells. 11.Our eye lids shut automatically and protect

11 Best Fruits for Healthy Eyes

Eyes are amazing as it helps us to see the outside world.Eating fruits and vegetables keeps our eyes healthy.Naturally, fruits and vegetables are packed with many vitamins and minerals which is required for our over all good health. Eating right amount of fruits and vegetables in our daily diet reduces the risk of night blindness,a ge related macular degeneration , cataracts and other eye diseases . Vitamin C, Vitamin E, and Vitamin A(and beta carotene) are dietary antioxidants.These antioxidants protects our body against diseases,keeps our cells and tissues healthy, strengthens blood vessels and boost our immune system. Beta carotene and vitamin A protects the eyes against dry eyes,night blindness,strengthens retina. Citrus fruits are good source of vitamin C. They contain flavonoids which protects eyes from cataract and macular degeneration. eg: grapes,cherries,oranges Lutein & Zeaxanthin are antioxidants which protect the eyes from damage, reduces the risk o

The Eye

Search This Blog