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PPO2 > Lecture 9 NCT for clerkships > Flashcards

Lecture 9 NCT for clerkships Flashcards

1
Q

T/f Small changes in the rate of filtration or production of the aqueous will affect the IOP

A

T

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2
Q

(increase/decrease) in filtration will lead to increase in IOP

A

decrease

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3
Q

(increase/decrease) in produciton will lead to increase in IOP

A

increase

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4
Q

T/F when you are laying down your IOP in higher then when you sit

A

T

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5
Q

(increased/reduced) systemic blood pressure is associated with reduced IOP

A

reduced

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6
Q

____ pressure is vitally improtant when there is glaucomatous or optic nerve damage

A

blood

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7
Q

The balance between the blood pressure and the IOP is (perfusion pressure/blood pressure)

A

perfusion pressure

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8
Q

(systolic/diastolic)BP-IOP = perfusion pressure

A

diastolic

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9
Q 
the intrinsic tendency of an organ to maintain constant blood flow despite changes in perfusion pressure to that organ by increasing vascular resistance of the smaller retinal vessels 
is called (autoregulation/regulation)
A

autoregulation

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10
Q

calculate the ocular perfusion pressure if the

diastolic BP is 80 and the IOP is 20

A

60

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11
Q

Central venous pressure come from teh blood flow at the ___ cava (leaving/returning) to the heart

A

vena, returning

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12
Q

the central venous pressure is (half/all) of the IOP

A

half

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13
Q

CVP rises when given too (little/much) IV fluids

A

much

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14
Q

T/f central venous pressure increase can cause myocardial infarction

A

T

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15
Q

CVP will fall when there is blood ___

A

loss

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16
Q

Increased IOP
Optic nerve damage
Visual function loss
– all three are associated with (cataracts/gluacoma)

A

glaucoma

17
Q

T/F increase in IOP is never gradual

A

F Increase in IOP may be gradual

18
Q

T/F a graudal increase in IOP could be asymptomatic

A

T

19
Q

Nausea
Pain
Haloes
– these can all be caused by a (decrease/increase) in IOP

A

increase

20
Q

acute angle closure glaucoma can cuase a (increase/decrease) in IOP

A

increase

21
Q

phthisis bulbi is associated with a (high/low) IOP

A

low

22
Q

Diurnal (during the day) variation , arterial pulse, position, vascular integrity all affect the ____ measurement

A

IOP

23
Q

What time of day is the diurnal variation highest?

A

early morning

24
Q

Clonidine and beta blockers (increase/decrease) IOP

A

decrease

25
Q

marijuana and alcohol (increase/decrease) IOP

A

decrease

26
Q

steroid may (reduce/increase) IOP

A

increase

27
Q

The initial injury shuts down the ciliary body and (increases/reduces) IOP in a trauma
Later inflammatory cells clog the trabecular meshwork (decreasing/increasing) the IOP

A

reduces, increasing

28
Q

Thicker corneas may inadvertently (decrease/increase) the estimate of the IOP

A

increase

29
Q

what is the corneal thickness in micrometers thatwill have a correciton value of 0

A) 625
B)545
C)505

A

545

30
Q

Non contact tonomter will be faily accurate up to __ mmHg

A)25
B)45
C)50
D)30

A

30

31
Q

T/F non contact tonometer is not repeatable

A

F

Displaces virtually no aqueous so it is repeatable

32
Q

T/F non-contact tonometer causes damage to corneal epithelium

A

F. no damage to corneal epithelium

33
Q

T/F you can measure edematous corneas through a soft contact lens using non-contact tonometer

A

T

34
Q

T/F hihg pressure becomes inaccurate with a non-contact tonometer

A

T

35
Q

T/F NCT is an excellent screening tool, but the standard of care in optometric practice is Goldmann tonometry and you will be held to this standard in a court of law.

A

T

36
Q

The average IOP 15 mmHg, normal is considered from a range of __to__mmHG

A)2 to 15
B)4 to 18
C)5 to 20
D)8 to 23

A

8 to 23

37
Q 
Asymmetry of more than \_\_mm is considered significant 
A)2 
B)4 
C)5 
D)8
A

2

38
Q

A diurnal (during the day) variation of more than ___ mmHg is considered significant

A)2
B)4
C)5
D)8

A

4

39
Q

A non-contact tonometer (doesn’t/does) require a anesthetic

A

doesn’t

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