science human eye

structure of human eye

Sclera This is the outermost covering of the eye. It acts as a strong, protective white layer called the sclera (commonly known as the white of the eye).

cornea The transparent portion at the front of the sclera is referred to as the corneal It is through the cornea that light first enters the eye.

Iris Located behind the cornea, the iris is a dark muscular and ring-like structure The color of the iris gives the eye its color. It plays an essential role in regulating the amount of light entering the eye by adjusting the size of the pupil.

Pupil The small opening found within the iris is known as the pupil. The iris manages the size of this opening to control the quantity of light that passes into the eye.

Lens Positioned behind the pupil is a transparent structure called the lens. It changes its shape, due to the action of ciliary muscles to focus light onto the retina., It becomes thinner to focus on far objects and thicker to focus on nearby ones.

Retina This is a light-sensitive layer filled with numerous nerve cells. It captures the image formed by the lens and converts it into electrical signals. These signals are then transmitted to the brain via optic nerves.

Ciliary Muscles These muscles modify the shape of the lens during the accommodation reflex, which is essential for adjusting focus at various distances.

Vitreous Humour: This gel-like substance provides nutrition to the eye and helps maintain its proper shape and structure.