Lecture 9 NCT for clerkships Flashcards
T/f Small changes in the rate of filtration or production of the aqueous will affect the IOP
T
(increase/decrease) in filtration will lead to increase in IOP
decrease
(increase/decrease) in produciton will lead to increase in IOP
increase
T/F when you are laying down your IOP in higher then when you sit
T
(increased/reduced) systemic blood pressure is associated with reduced IOP
reduced
____ pressure is vitally improtant when there is glaucomatous or optic nerve damage
blood
The balance between the blood pressure and the IOP is (perfusion pressure/blood pressure)
perfusion pressure
(systolic/diastolic)BP-IOP = perfusion pressure
diastolic
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)
autoregulation
calculate the ocular perfusion pressure if the
diastolic BP is 80 and the IOP is 20
60
Central venous pressure come from teh blood flow at the ___ cava (leaving/returning) to the heart
vena, returning
the central venous pressure is (half/all) of the IOP
half
CVP rises when given too (little/much) IV fluids
much
T/f central venous pressure increase can cause myocardial infarction
T
CVP will fall when there is blood ___
loss
Increased IOP
Optic nerve damage
Visual function loss
– all three are associated with (cataracts/gluacoma)
glaucoma
T/F increase in IOP is never gradual
F Increase in IOP may be gradual
T/F a graudal increase in IOP could be asymptomatic
T
Nausea
Pain
Haloes
– these can all be caused by a (decrease/increase) in IOP
increase
acute angle closure glaucoma can cuase a (increase/decrease) in IOP
increase
phthisis bulbi is associated with a (high/low) IOP
low
Diurnal (during the day) variation , arterial pulse, position, vascular integrity all affect the ____ measurement
IOP
What time of day is the diurnal variation highest?
early morning
Clonidine and beta blockers (increase/decrease) IOP
decrease
marijuana and alcohol (increase/decrease) IOP
decrease
steroid may (reduce/increase) IOP
increase
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
reduces, increasing
Thicker corneas may inadvertently (decrease/increase) the estimate of the IOP
increase
what is the corneal thickness in micrometers thatwill have a correciton value of 0
A) 625
B)545
C)505
545
Non contact tonomter will be faily accurate up to __ mmHg
A)25
B)45
C)50
D)30
30
T/F non contact tonometer is not repeatable
F
Displaces virtually no aqueous so it is repeatable
T/F non-contact tonometer causes damage to corneal epithelium
F. no damage to corneal epithelium
T/F you can measure edematous corneas through a soft contact lens using non-contact tonometer
T
T/F hihg pressure becomes inaccurate with a non-contact tonometer
T
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.
T
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
8 to 23
Asymmetry of more than \_\_mm is considered significant A)2 B)4 C)5 D)8
2
A diurnal (during the day) variation of more than ___ mmHg is considered significant
A)2
B)4
C)5
D)8
4
A non-contact tonometer (doesn’t/does) require a anesthetic
doesn’t
