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sight and haering

TermDefinition
cornea the transparent layer forming the front of the eye.
pupil The opening of the iris.
iris a flat, colored, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening pupil in the center.
lens By changing its shape, the lens changes the focal distance of the eye.
retina a layer at the back of the eyeball containing cells that are sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
rods A type of specialized light-sensitive cell photoreceptor in the retina of the eye that provides side vision and the ability to see objects in dim light night vision.
cones A type of specialized light-sensitive cell photoreceptor in the retina of the eye that provides color vision and sharp central vision.
optic any of the elements as lenses, mirrors, or light guides of an optical instrument or system —usually used in plural b : an optical instrument.
nerve
eardrum
hammer
anvil
stirrup
cochlea
semicircular canals
Created by: victoria.