Did Your Know the Eye Parts?

Eye Parts?

The eye has many parts. Some of the main parts are listed and described below.

Lens

• The transparent crystalline lens of the eye is located immediately behind the iris.

Cornea

• The cornea is a transparent dome which serves as the outer window of the eye. The cornea is the most powerful structure focusing light entering the eye.
  

Retina

• The retina is the innermost layer of the eye. It is composed of nerve tissue which senses the light entering the eye.
• The retina sends impulses through the optic nerve back to the brain, which translates the impulses into images that we see.
• There are 4 types of light-sensitive receptors found in the retina
  

rods

cones that absorb long-wavelength light (red)

cones that absorb middle-wavelength light (green)

cones that absorb short-wavelength light (blue)

Pupil

• The pupil is the hole in the center of the eye where light passes through.

Iris

• The iris is the colored part of the eye. It is a thin diaphragm composed mostly of connective tissue and smooth muscle fibers. The iris lies between the cornea and the crystalline lens.

Optic nerve

• The optic nerve is a continuation of the axons of the ganglion cells in the retina. It acts acts like a cable connecting the eye with the brain.
• The optic nerve is also called the cranial nerve II.
  

Sclera

• The sclera is the white, opaque portion of the eye. It provides protection and serves as an attachment for the extraocular muscles which move the eye.