Human eye

The human eye is a spherical structure that helps us to see the objects .The human eye is an organ that reacts to light in many circumstances. As a conscious sense organ the human eye allows vision; rod and cone cells in the retina allow conscious light perception and vision, including color differentiation and the perception of depth.The eye receives oxygen through the aqueous. Its function is to nourish the cornea, iris, and lens by carrying nutrients, it removes waste products excreted from the lens, and maintain intraocular pressure and thus maintains the shape of the eye. This gives the eye its shape. It must be clear to function properly. the front part (what you see in the mirror) includes:

• Iris: the colored part.
• Cornea: a clear dome over the iris.
• Pupil: the black circular opening in the iris that lets light in.
• Sclera: the white of your eye.
• Conjunctiva: a thin layer of tissue that covers the entire front of your eye, except for the cornea.

How does the human eye actually work ? The lens focuses light through the vitreous humor, a clear gel-like substance that fills the back of the eye and supports the retina. The retina receives the image that the cornea focuses through the eye's internal lens and transforms this image into electrical impulses that are carried by the optic nerve to the brain.

Human Eye Media

• Arizona eye model.png

  Arizona Eye Model. "A" is accommodation in diopters.

• 3D Medical Animation Eye Structure.jpg

  A detailed medical illustration of the eye

• MRI of human eye.jpg

  MRI scan of the human eye

• Schematic diagram of the human eye. It shows a horizontal section through the right eye.

• Gray892.png

  Gray

• Mairead cropped.png

  Side-view of the human eye, viewed approximately 90° temporal, illustrating how the iris and pupil appear rotated towards the viewer due to the optical properties of the cornea and the aqueous humour

• Pupillary light reflex.jpg

  The pupil of the human eye can range in size from 2 mm to over 8 mm to adapt to the environment

• Voluntary pupil dilation.gif

  Dilation and constriction of the pupil

• Fundus photograph of normal right eye.jpg

  The light circle is the optic disc where the optic nerve exits the retina.

• The two eyes converge to point to the same object.