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29 Cards in this Set
- Front
- Back
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lysozyme
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antibacterial enzyme
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conjunctivitis
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inflammation of the conjunctiva
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sty
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inflammation of the ciliary glands or small oil glands
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fibrous tunic
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protective layer composed of dense avascular connective tissue.
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vascular tunic
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middle layer called the uvea, contains the choroid, ciliary body, iris, pupil
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sensory tunic
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contains the retina, pigmented epithelium, contains neural layer, rods and cones
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cataracts
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in the elderly the lens becomes hard and opaque which then causes vision to become hazy or obstructed.
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glaucoma
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intraocular pressure reaches dangerously high levels the retina and optic nerve are compressed resulting in pain and possible blindness
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anterior segments
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anterior to the lens contain aqueous humor
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posterior segments
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behind the lens filled with vitreous humor
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anterior chamber
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located before the iris
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posterior chamber
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located behind the iris
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refraction
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rays of light are bent when they pass from one medium to the next. same with light in the visual field cornea>lens>vitreous humor
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accomodation
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ability of the eye to focus differentially for objects or near vision
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real image
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image formed on the retina as a result of the refractory activity of the lens
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emmentropic eye
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normal eye
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myopia
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near sighted image focuses in front of the retina
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hyperopia
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far sightedness, image focus behind the retina
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astigmatism
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irregularities in the curvature of the lens and/or cornea. Leads to blurred vision
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presbyopia
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old vision. lens elasticity decreases dramatically. results in difficulty focusing for near or close vision
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near point accomodation
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a way to test elasticity. closest point at which you can see clearly
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snellen visual acuity test
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vision tests which contains carious sized letters
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astigmatism test
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tests for defects in the refracting surface of the lens and/or cornea
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color blindness
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a deficiency in the cones or photoreceptors which make certain colors
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ishihara plates
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used to test for color blindness
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binocular vision
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overlapping vision both eyes look in approximately the same direction
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panoramic vision
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eyes on the side of the head see in two different directions
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eye reflex activity tests
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photopupillary reflex (light), accomodation pupillary reflex (object is brought closer)
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convergence reflex
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(crossed eyes) simultaneous inward movement of both eyes
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