The Human Eye

Structure, How it Works and Correcting Eye Problems


This is a flyer about the eye and how it works. I also did some research about Correcting Eye Problems. I names all of the parts of the eye and I explained how we can fix eye problems.

The Structure of an Eye (Front)

Light goes through the cornea, a transparent curved layer in front the iris and the pupil. The cornea is a protective layer for the front of the eye and it also focuses the light on the retina at the back of the eye. After passing through the cornea, the light goes through the pupil(The black dot in the middle of your eye). The circular colored area around your pupil is called an iris. The iris controls how much light goes through the eye. Too much or too little light would damage the eye. Behind the iris, there is the lens. The lens changes shape and focuses the light for the retina. The lens becomes thicker to focus on nearby objects, but becomes thinner to focus on objects that are further away.

The Structure of an Eye (Back)

The retina contains cells that sense light (photoreceptor) which nourishes on blood vessels. There are two types of photorceptors; cones and rods. Cones are responsible for detailed center vision and color vision and rods are responsible for night and side vision. The macula is the most sensitive part of the retina. It is a bunch of tightly packed photoreceptors, which are cones. The high density of cones in the macula makes the image more detailed. Each photoreceptor is linked to a nerve fiber.

Correcting Eye Problems

For years, the only way to correct the mistake of eye refraction was to wear glasses, but now you can do laser eye surgery. In laser eye surgery, they reshape the the cornea and adjusts the way light enters the eye. Artificial Lenses are put in the eye to make it refocus the light rays and make their vision sharper.