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23 Cards in this Set
- Front
- Back
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refraction is the
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bending of light rays
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in refraction light rays change the ____ as they pass through substances of different ____
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speed - densities
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light is refracted as it passes how many areas of the eye
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3
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what 3 areas does light pass through and gets refracted
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cornea - entrance of lens - exit of lens
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since the lens shape can be changed, it can be use to refract light to a specific
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distance
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since the lens shape can be changed, it allows light to
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focus on retina
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no focusing is necessary for
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distant objects (over 6m away)
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what are 3 process that must occur for near objects to produce clear vision
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accommodation - constriction of the pupils - convergence of the eyeballs
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in accommodation what do ciliary muscles do
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contract
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in accommodation ____ ____ release tension to focus image on retina
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suspensory ligaments
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in accommodation the lens ____ & ____ to focus image on retina
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thickens - bulges
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in constriction of pupils the ____ muscles in the iris makes the pupil ____
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constrictor - smaller
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constriction of pupils focuses light in a ____ ____
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finer point
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in convergence of the eyeballs what muscles contract
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medial rectus muscles
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in convergence of the eyeballs, each eye moves
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medially
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convergence of the eyeballs focuses on ____ objects
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near
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emmetropia definition
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normal vision
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myopia definition
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nearsightedness
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in myopia, object focuses in
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front of the retina
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in myopia, eyeball is too
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long
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hyperopia definition
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farsightedness
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in hyperopia, object focuses
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behind the retina
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in hyperopia, eyeball is too
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short
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