| A | B |
|---|
| binocular vision | ability to see an object with both eyes at the same time |
| iris | varies in color and controls the amount of light entering the eye |
| cornea | clear covering of iris and pupil that protects the eye from dust particles and foreign matter |
| pupil | opening in the eye through which light enters |
| tears | saline liquid that washes the eye and keeps the cornea moist |
| eyelid | large folds/flaps of skin that wipe the eye clean and spread the tears |
| eyelashes | hairs on hte eyelid used to screen large objects from entering the eye |
| lens | flexible disc shaped structure that focuses the image of an object |
| eyeball muscles | six muscles atached to the sides of the eye, they keep the 2 eyes focused on a single point |
| aqueous humor | tranparent liquid behind cornea that helps keep the corneas shape |
| retina | light sensitive innermost layer of eye, that contains the cones and rods. image is projected on cones and rods in retina and let us see colors and shades of black and white |
| optic nerve | cord or bundle of nerves that carry signals from eye to brain |
| blind spot | area of the retina that the optic nerve enters and there are no cones and rods |
| sclera coat | tough, white, outer layer of eye, makes the ball that gives eye its shape |
| vitreous humor | transparent jello like substance that fills the eye from lens to retina, helps the eye keep its shape |
| chorid | middle layer of eye between retina and sclera, contains the blood vessels |
