Lecture 9 NCT for clerkships

Question 1

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

Answer 1

T

Question 2

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

Answer 2

decrease

Question 3

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

Answer 3

increase

Question 4

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

Answer 4

T

Question 5

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

Answer 5

reduced

Question 6

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

Answer 6

blood

Question 7

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

Answer 7

perfusion pressure

Question 8

(systolic/diastolic)BP-IOP = perfusion pressure

Answer 8

diastolic

Question 9

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)

Answer 9

autoregulation

Question 10

calculate the ocular perfusion pressure if the

diastolic BP is 80 and the IOP is 20

Answer 10

60

Question 11

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

Answer 11

vena, returning

Question 12

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

Answer 12

half

Question 13

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

Answer 13

much

Question 14

T/f central venous pressure increase can cause myocardial infarction

Answer 14

T

Question 15

CVP will fall when there is blood ___

Answer 15

loss

Question 16

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

Answer 16

glaucoma

Question 17

T/F increase in IOP is never gradual

Answer 17

F Increase in IOP may be gradual

Question 18

T/F a graudal increase in IOP could be asymptomatic

Answer 18

T

Question 19

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

Answer 19

increase

Question 20

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

Answer 20

increase

Question 21

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

Answer 21

low

Question 22

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

Answer 22

IOP

Question 23

What time of day is the diurnal variation highest?

Answer 23

early morning

Question 24

Clonidine and beta blockers (increase/decrease) IOP

Answer 24

decrease

Question 25

marijuana and alcohol (increase/decrease) IOP

Answer 25

decrease

Question 26

steroid may (reduce/increase) IOP

Answer 26

increase

Question 27

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

Answer 27

reduces, increasing

Question 28

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

Answer 28

increase

Question 29

what is the corneal thickness in micrometers thatwill have a correciton value of 0 A) 625 B)545 C)505

Answer 29

545

Question 30

Non contact tonomter will be faily accurate up to __ mmHg A)25 B)45 C)50 D)30

Answer 30

30

Question 31

T/F non contact tonometer is not repeatable

Answer 31

F | Displaces virtually no aqueous so it is repeatable

Question 32

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

Answer 32

F. no damage to corneal epithelium

Question 33

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

Answer 33

T

Question 34

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

Answer 34

T

Question 35

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.

Answer 35

T

Question 36

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

Answer 36

8 to 23

Question 37

``` Asymmetry of more than __mm is considered significant A)2 B)4 C)5 D)8 ```

Answer 37

2

Question 38

A diurnal (during the day) variation of more than ___ mmHg is considered significant A)2 B)4 C)5 D)8

Answer 38

4

Question 39

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

Answer 39

doesn't