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Eyes and Auditory

ch. 16

QuestionAnswer
snellen chart asseses distant vision, which tests the function of CN 2 (optic nerve), tests visual acuity
use of snellen chart clients stands 20ft from it, leave contacts or glasses in, cover one eye and read smallest line possible, then read any letters on the line below, use both eyes to see which horizontal lines is longer (perception), name colors of two lines
what does 20/30 mean they can read at 20ft what a normal person can read at 30ft
confrontation test tests function of CN II (optic N)
use of confrontation test have client stand 2-3 ft from u, facing you, both cover one eye, extend pen to farthest periphery and gradually bring it to midline, have client report when first seen, should see it at the same time
cardinal fields CN III (oculomotor N), CN IV (trochlear N), CN VI (abducens N)
test have client look at you, position finger 10-12 in from clients nose, keep their head still and use only eyes to follow, move hand to upper extreme to center, lower inner extreme, move to temporal nasal extreme, hold, move to opp upper outer extreme
norm result of cardinal field test parallel tracking of object with both eyes, mild nystagmus at extreme lateral gaze normal
Created by: ashley0683
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