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What is the lens?
not a layer of the eye wall, but is a transparent structure suspended from the ciliary body by suspensory ligaments
What is aqueous humor?
Watery fluid filling anterio cavity which mantains presure, nourishes, and refracts light
Describe the pathway of the aqueous humor
ciliary body, to the posterior chamber, then the pupil, then the anterior chamber,, the the scleral venous sinus aka canal of schlemm
What is the canal of schlemm?
Permealble blood vessel at junction of cornea and sclera that reabsorbs aqueous humore
What is the function of the rods, and what do they contain?
outline black and white vision at night, and provide peripheral vision
describe the pathway of light
cornea>aqueous humor of the anterior chamber>pupil>aqueous humor of the posterior chamber>lens>victreous humor>retina>optic disk>optic neve>cerebrum
What is refraction?
when light rays bend as they pass from one transparent substance to another with varrying density
How does the lens refract light?
by varrying and making itself less or more convex greater convexity the more the light bends, the flatter the lens, the less the lens bends
What happens if the eyeball is to short?
light rays converge behind the retina and results in far sightedness
What happens if the eyeball is too long?
light rays converge in front of the retina and results in near sightedness
What should happen in distance vision?
light rays will be parrallel lines to the eye, there is less refraction to focus on retina
What should happen in close vision?
light rays will spread apart as they enter the eye, more refraction is needed to focus on retina
What does the ciliary body muscle do during each type of vision?
distance it relaxes, close it contracts
What happens to the suspensory ligaments during each type of vision?
distance they are taut, close they are relaxed
What happens to the lins during each type of vision?
distance the lens is less convex, and close the lens is more convex
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