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Eye&lens definitions

definitions for eye and lenses junior science

TermDefinition
Compound Lens Combination of two or more lenses in contact with each other
Accommodation Adjusting the focal length of a lens to focus near or distant objects clearly on the retina
Short-sightedness When distant objects cannot be seen clearly
Long-sightedness When near objects cannot be seen clearly
Myopia When near and distant objects cannot be seen clearly, only middle objects can be seen clearly.
Pupil a hole in the eye that allows light through
Lens The part of the eye that refracts light from the object so the image forms on the retina
extraocular muscles muscles around the eye ball that control eye movement
iris the coloured ring of muscle that contracts to let less light in and relaxes to let more light in.
optic nerve a bundle of nerves at the back of the retina that transmits the image to the brain
retina a layer of cells at the back of the eye where the image forms
cones receptors on the retina that detect colour
rods receptors on the retina that detect light and dark/black and white
cornea clear protective film covering outer eye which slightly refracts light.
sclera whites of the eyeball
ciliary muscles muscles that control the curvature of the lens and therefore its ability to focus the image on the retina
vitreous humour colourless fluid in the middle of the eyeball that gives the eyeball its shape
convex lens a lens that bulges outwards on both sides and is used to magnify objects eg magnifying glass.
concave lens a lens that bulges inwards on both sides and is used to make objects appear smaller eg glasses for short sighted people.
prism a triangular 3D object of glass or plastic that can refract and disperse light
Created by: simkar
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