How Does the Human Eye Work | All About the eyes.

at April 29, 2017 Labels: Eye.

Your Eye works like a kind of Camera. As you want to know that how human eye work lets take the example of camera you will understand. It takes picture around you and convey it to your brain. Human brain works out that what you are seeing around you and it act like a Memory. It happen just like that you open your eye in the morning and close your eyes at night while sleeping.

As you can see in the above Diagram about the comparison of camera and eye, Actually camera is discovered as a copy to see the human eye.

How Camera Works?

Light rays from an object passes through the lens and then the camera record or capture a snap. The picture that is captured in a camera is Upside down but when we see it in the Computer and device, it was not upside down.

How your eyes work?

Your eyes work as the similar way like camera, as light passes through your eye and the image is recorded back to your eye retina. The picture that your eye takes it also upside down!
As the Question is that "why you don't see the image upside down?"
When you see the image the eye send it to your brain and your brain turns the picture to the right way and you see the things right way up. As we read in the previous article.

The structure of eye:

Iris
Cornes.
Lens

Iris: It is similar to the diaphagm of camera,your iris widens in Dim light and Narrow in bright light.Compare this to the average camera lens which may have f-number from f/2.8 to f/22. The main function of iris not to control the intensity of light coming into your eyes.

Cornea and Lens: There are two lens in your eyes, Cornea and eye lens.

Cornea,the front surface of eye, does more of focusing in your eye.
Eye-Lens provide adjustable fine tunning of focus.

This is because the cornea air surface has large change in index of refraction, so light bends alot.
The power of eye lens is 43 Dipoter.
As like our eye lens focus the thing we are trying to see.

So, the eye lens changes its focal length by changing its shape and it depends upon our eye muscles that contract or relax. Contract when the more bending power with shorter focal length and Relax when the less bending power with the long focal length.