EYE

EYE

• The human eye is contained in a bony socket in the skull.
• Light rays that enter the pupil are focused by the cornea and lens to forms an image o the retina.
• it is reacting to light and pressure, as a source organ, the mammalian eye allows vision.
• A human eye allows three dimensional, moving image, normally colored in day light.
• These images are converted into electrical impulses, which are transmitted along the optic nerve to the brain.

• The organ of sight in humans and other animals.
• The human eye can differentiate between about 10 million colors, and is possibly capable of detecting a single photon.
• light detecting organ in some invertebrates.

• EYEBALL-   The ball of the eye within the lids and socket.
• EYELASH- Each of the hairs  growing on the edges of the eyelids.

COMPONENTS-

The eye has 3 layers:      

• The outermost layer- fibrous tunic (composed of cornea and sclera)
• The middle layer- vascular tunic or uvea (composed of choroids and cilliary body, pigmented epithellium, iris)
• The innermost layer- retina (which gets its oxygenation from the blood vessels of the choroid as well as the retinal vessels)