The human eye

The human eye is an organ that reacts to light and has several purposes. As a sense organ, the mammalian eye allows for vision. 

Today we have learned about the main parts of the human eye. 

First, we have noted those parts in a drawing of a section of the eye. Then we have defined the specific function of each part. For example, we have learned that specialized cells located on the retina, called rods and cones cells, allow for conscious light perception and vision including color differentiation and the perception of depth. 

The human eye can distinguish about ¡¡¡10 million colors!!!

The eye is not shaped like a perfect sphere. The smaller frontal unit, transparent and more curved, called the cornea is linked to the larger white unit called the sclera.

 

The iris is the colored circular structure concentrically surrounding the center of the eye, the pupil, which appears to be black. The size of the pupil, which controls the amount of light entering the eye, is adjusted by the muscles of the iris. 

 Light enters the eye through the cornea, then the pupil and then through the lens controlled by cilliary muscles. Light falling on the light-sensitive cells of the retina is converted into electrical signals that are carried to the brain by the optic nerves.

With all this information, we have made a mural.

  

In the next practice at the lab, we will use that information to dissect a sheep's eye and try to understand how this important sensory organ works. We expect new emotions!

Did you know that a device known as an ophthalmoscope is used to see inside the eye?