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The Eye

Science Vocabulary

TermDefinition
Visible Light (VL) Wavelengths the human eyes perceive.
ROYGBIV all the colors of the VL spectrum.
white light the reflection of all colors of VL.
cornea transparent curved front of the eye. Dome-shaped; covers iris and pupil. It helps light rays converge as they enter the eye.
pupil hole through which light enters the eye. Surrounded by iris. "Black spot in the eye."
iris pigmented muscular ring surrounding the pupil. Controls the amount of light entering the eye. Made of smooth muscle tissue.
lens transparent, convex structure (M&M shaped.) Focuses incoming light rays by stretching or contraction. It separates the anterior and posterior chambers of the eye along with the iris. Causes light to come to a certain point on the retina.
retina specialized layer of photoreceptors called rods and cones.
optic nerve carries the sensory information from the rods and cones to the visual cortex of the brain. It is in the posterior part of the eye and is a little less than 2 mm in diameter.
nearsighted ability to see up close but not clearly at distances. Also known as myopia. Eyeball is "too long" or cornea is too curved. Causes images to be focused in front of the retina.
farsighted ability to see at distance but not clearly up close. Also known as hyperopia. Eyeball is "too short" or cornea has too little curvature. Causes images to be focused behind the retina.
color blindness different or decreased perception of color. Affecting 8% males and 1% females.
List the parts of the human eye in order.... Cornea, Pupil, Lens, Retina, Optic Nerve.
Blind Spot Where the optic nerve meets the eye. No sight occurs at this spot and no cones or rods are present.
Rods Allow us to see light. Gives the eye the ability to perceive the difference between light and dark.
Cones Allow us to distinguish color.
Converge To come together from different directions; meet.
Convex
Having a surface or boundary that curves or bulges outward, as the exterior of a sphere (the opposite of a concave structure.)
Created by: fkjones