CP2 chapter 6 Flashcards Preview

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Flashcards in CP2 chapter 6 Deck (68):
1

visual acuity test

screening test to detect deficiencies in vision

2

color blindness

inability to distinguish certain colors

3

most common color blindness

red and green

4

audiometer

instrument that emits sound waves at various frequencies

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irrigation

washing a body canal with a flowing solution

6

instillation

dropping a liquid into a body cavity

7

sclera

outer layer
tough, white fibrous connective tissue

8

cornea

transparent covering over the colored part of the eye

9

choroid

middle layer
absorb stray light rays

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ciliary body

contains muscles that control the shape of the lens

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function of the suspensory ligaments

suspend the lens in place

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lens

responsible for focusing the light rays on the retina

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iris

colored part
controls the size of the pupil

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pupil

opening in the eye that permits the entrance of light rays

15

retina

inner layer
focus light rays and then transmit to the brain

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anterior chamber

area between the cornea and iris

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posterior chamber

area between the iris and the lens

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vitreous humor

transparent jelly like material

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function of the vitreous humor

maintain the shape of the eyeball

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conjunctiva

membrane that lines the eyelids and covers the front of the eye except the cornea

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visual acuity

acuteness or sharpness of vision

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errors of refraction

light rays aren't being refracted or bent properly and aren't focused on the retina

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refraction

ability of the eye to bend the parallel light rays coming into it so that they can be focused on the retina

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myopia

nearsighted

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nearsighted

difficulty seeing objects at a distance

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hyperopia

farsighted

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astigmatism

refractive error that causes distorted and blurred vision for both near and far objects

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presbyopia

starts when you turn 40
decrease in the elasticity of the lens of the eye

29

ophthalmologist

physician who specializes in diagnosing and treating diseases and disorders of the eye

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optometrist

measures visual acuity and prescribing corrective lenses for the treatment of refractive errors
CAN'T PRESCRIBE MEDICATIONS

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optician

interprets and fills prescriptions for eyeglasses and contact lenses

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distance for snellen test

20 ft

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top number for snellen test

distance at which the test is conducted

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below number for snellen test

distance from which a person with normal visual acuity can read the row of letters

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what eye do you start with for the snellen?

right eye

36

why should you keep the eye open under the occluder?

causes squinting of the eye that is being tested

37

near visual acuity testing

ability to read close objects

38

congenital defects

more common and are inherited

39

who do congential color vision deficiencies affect?

males

40

acquired defects

acquired after birth

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Ishihara

checks for color blindness

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eye irrigation

washing the eye with a flowing solution

43

purpose of eye irrigations

cleanse eye, ocular discharges, or harmful chemicals

44

eye instillation

dropping of a liquid into the lower conjunctival sac of the eye

45

eye instillations treatment

eye infections, soothe eye, dilate pupil

46

ear functions

hearing and in maintaining equilibruium

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auricle

flap of cartilage covered with skin that projects from the side of the head

48

function of the auricle

receive and collect sound waves and to direct them toward the external auditory canal

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external auditory canal

1 in long

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cerumen

lubricates and protects the ear canal

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shape of external auditory canal

S

52

tympanic membrane

pearly gray, semitransparent membrane that receives sound waves

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eustachian tube

connects the middle ear to the nasopharynx

54

cochlea

essential organ of hearing

55

semicircular canals

help to maintain equilibrium

56

normal hearing frequencies

300-4000

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conductive hearing loss

results from physical interference

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sensorineural hearing loss

results from damage to the inner ear or auditory nerve

59

most common cause of sensorineural hearing loss

presbycusis

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mixed hearing loss

combination of conductive and sensorineural loss

61

masking

presenting sound to the ear not being tested so that the pts response is based on on hearing in the ear being tested

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gross hearing test

identify a large hearing impairment

63

tuning fork test

general assessment of hearing

63

Weber test

useful assessment of hearing loss when one ear hears better than the other

64

rinne test

compares the duration of sound perception by air conduction with that of bone conduction

65

audimetry

measurement of hearing acuity using a audiometer

66

typanometry

determines the cause of hearing loss

67

ear irrigation cotton swab

dry