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32 Cards in this Set
- Front
- Back
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Retinitus Pigmentosa
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Slow loss of peripheral vision
night blind to total blindness |
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Diabetic retinopathy
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Nerves cannot feed retina
Ischemia: blood vessls serving retina Retina detaches from the back of the eyes |
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Opthamalogist
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MD specializing in disease and muscles of the eye
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Optomotrist
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Person who measures for glasses and visual acuity
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Optrician
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Makes and sells glasses
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Definition: Legally Blind
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20/200 with correction
20/20 with 20 degrees or less field vision |
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Rods
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periphery of eye
More plentiful Black and white, low and dimmed vision/light |
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Cones
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Color and acquity
More plentiful in center of best vision Broad day light |
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Cornea
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Clear part of eye
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Sclera
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White part of the eye
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Lens
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refractive medium
relaxes and contracts |
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Retina
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Converts to electrical enery
Light sensitive back of eye |
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Conjuctiva
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Mucus membranes
line socket and lids |
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Iris
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color part
open pupil to let more light in |
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Optic Nerve
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originates at retina
Goes to brain |
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Optic Disc
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all cells
Blind spot |
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Macula
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general area try to get image to focus on
Mostly cones Area of good vision |
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Fovia
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Very center of macula
Not good for night vision All cones centered here Best vision in good light |
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Ciliary Body
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set of muscles that makes lens and iris open or close
contracts and releases lens and iris |
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Cataracts
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cloudiness/opacity of lens
all or partial replacement of lens needed prosthesic impant if partial cataract- may come back seile cataract- with old age result of trauma, surgical, heat, or system disease |
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presbyopia
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old vision
lens doesn't refract fully anymore hardening of lens |
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astigmatism
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multi-focusing
irregular shaped lens or cornea |
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strabismus
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crossed eyes
muscular imbalance between eyes Can be corrected surgically |
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Hyperopia
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Far sited
Focus behind retina Distance is better |
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Myopia
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Near sited
Focus in front of retina |
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Emmetropia
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Proper vision with refraction
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Amblyopia
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lazy eye
patch is put on good eye to correct brain confused and shuts down lazy eye |
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Nystagmus
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involuntary side to side movements of eye
spastic |
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Glaucoma
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#1 cause of blindness
pressure in eye due to not draining fluid interoccular pressure blocakge of canal of schlemm Medications to open up- laser surgery Problem: if not caught early -> blindness |
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Macular degeneration
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areas of no vision
eye creates an additional blind spot macular holes- no central vision |
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parapetologist
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mobility instructor
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low vision specialist
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optomologist with specialization
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