Flashcards in B12 Deck (164)
For someone with glaucoma, is the AH flow in and out equal?
Is the uveoscleral pathway the minor or major route /pathway in AH outflow?
Describe how AH flows in the uveoscleral pathway
AH enters the connective tissue between the ciliary muscle bundles, through the suprachoroidal space, and out through the sclera
Is the uveoscleral outflow affected by IOP?
The outflow rate through the uveoscleral route tends to ____ with age
What are the 3 layers of the TM?
The corneoscleral pathway is considered the ____ route
Describe the flow of AH in the corneoscleral pathway
AH passes through the TM, across SC, into its lumen
and into draining collector channels, aqueous veins and episcleral veins
Is the corneoscleral pathway IOP independent or dependent?
An acute rise in EVP results in a ___ ratio of increase IOP
When the aqueous outflow pump receives power from transient increases in IOP such as occur in systole of the cardiac cycle during blinking and during eye movement
In the corneoscleral pathway an increase of IOP causes drainage decrease or increase?
What will make schlemm's canal collapse on itself and obstruct into the venous system?
Constant, very high IOP
What 2 fluid compartments is the TM suspended between?
And are these at the same or different pressures?
Anterior chamber and schlemms canal
They have different pressures
What 5 things can cause AH outflow obstruction through occlusive angles?
-pigment dispersion glaucoma
In humans, ___% of the resistance to the AH outflow is localized to the TM, and ___% occurs beyond schlemm's canal
75% to TM
25% to SC
Can an injury to the TM cause an obstruction of AH outflow?
It sure can
What are the 3 long term influences on IOP?
What are the 6 short term influences on IOP?
-lid and eye movement
-food and drugs
T/F: IOP is under hereditary influence
Are IOP's different between men and women in the ages of 20-40?
Nope, they are equal
In older age groups, do men or women have a increase in mean IOP?
Myopic people have a ____ incidence of open angle glaucoma
T/F: there is a positive correlation between IOP and both axial length and increasing degrees of myopia
Does IOP change throughout the day?
When is the peak of IOP?
In the morning
T/F: IOP decreases changing from sitting to the supine position
False, it increases
Patient with systemic hypertension will have a greater IOP increases after ___ min in supine
Does blinking raise IOP?
Yes, by 10mmHg