| Term | Definition |
|
vitreous |
a thick, transparent liquid that fills the center of the eye--it is mostly water and gives the eye its form and shape |
|
iris |
the colored part of the eye--controls amount of light that enters the eye by changing the size of the pupil |
|
Lens |
a crystalline structure located just behind the iris --focuses light into the retina |
|
optic nerve |
transmits electrical impulses from the retina to the brain |
|
retina |
sensory tissue that lines the back of the eye--contains millions of phtoreceptors (rods and cones) that convert light rays into electrical impulses that are relayed to the brain via the optic nerve |