We define the human eye as the sense organ of vision. From the definition of the human eye, we understand that it is an organ that helps us to view our surroundings. Therefore, we can say that the human eye is a vital part of our body.

The structure of the human eye is rather complex. Therefore, we will only learn about some important parts of the human eye. These parts of the human eye are the cornea, iris and pupil, eye lens, ciliary muscles, retina, and optic nerves.

These parts of the human eye have roles to play in the journey of light through the human eye.
The covering of the human eye is transparent. It is known as the cornea. When light enters the human eye from the cornea, it passes through a muscular structure called the iris .It has a hole at the center called the pupil. The iris changes the size of the pupil by expanding or contracting it. Thus, it can change the amount of light that passes through the human eye.The eye-lens of the human eye focus the light on the retina. A human eye can easily see a faraway object as well as the object, kept very close to the eye.This becomes possible due to the ciliary muscles, which control the focal length of the eye-lens by stretching or contracting it. The optic nerves connected to the retina carry the information to the brain and we see the objects as they are.The given human eye diagram shows the structure of the human eye. With the help of the human eye diagram, we can understand the functions of the human eye better.

• This reply was modified 3 months, 1 week ago by  Aditya Singh.
• This reply was modified 3 months, 1 week ago by  Aditya Singh.