| 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 the eye through which light passes |
| 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 the 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 that are attached to the sides of the eye, they keep the two eyes focused on a single point |
| aqueous humor | transparent liquid behind cornea that helps keep the cornea's shape |
| optic nerve | carries signals from the eye to the brain |
| blind spot | area of the retina that the optic nerve enters and there are no cones or rods |
| sclera coat | tough, white, outer layer of the eye, makes the ball that gives the its shape |
| vitreous humor | transparent jello like substance that fills the eye for lens to retina, helps the eye keep its shape |
| chorid | middle layer of the eye between the retina and the sclera, contains the blood vessels |
| cones | light sensitive cells concentrated near the center of the retina that allow us to see color in bright light |
| rods | light sensitive cells concentrated near the outer edges of the retina that allow us to see black and white contrasts in dim light |
