lecture 8 tonometry Flashcards
aqueous humor is produced by_____ and controlled by _____
posterior chamber, carbonic anhydrase
glaucoma therapy focuses on which 2 mechanisms of increased IOP?
increasing outflow and inhibition of production
what are the 2 aqueous humor outflow routes?
trabecular (70%), uveoscleral (30%)
Do prostaglandins effect outflow or production of aqueous humor?
outflow
what is the MOST SIGNIFICANT factor in the etiology of increased IOP?
interference with aqueous outflow
(T or F) Non-contact tonometry (nct) is considered applanation tonometry?
true
(T or F) With applantation tonomtery, repeated reading will change IOP
false, however, with indention tonometry repeated reading would increase IOP
The avg corneal thickness is______
520 microns
diameter of applanation is______
3.06mm
area of applanation is_______
7.35mm
what is the “gold standard” of tonometry
goldmann tonometry
On the goldmann tonometry dial, each small mark is equal to ____
2mmHg
name 3 types of common diagnostic agents
anesthetics, cycloplegics, mydriatics
(T or F) patients may have a cross-sensitivity to Fluress if they have ever had an adverse reaction to novocaine
true
(T or F) patients may have a cross-sensitivity to proparacaine if they have ever had an adverse reaction to novocaine
false, if they are allergic to novocaine they will have cross sensitivity to fluress and proparacaine would be the alternative for that patient
On the Haag streit AT900, what does A and O mean
A=astigmatism, O=sphere
For the goldman tonometry, if K cyl is >4.00D, then measurement must be made ____ degrees from the meridian of thhe lower power
43 degrees
what is the separation in degrees of the white and red lines on the Goldmann tonometer?
43 degrees
To set up for goldmann tonometry:polarized filter is ____, mag is _____, illuminaion is ____
off, 10x-16x, high
Why do you want to put the sit lamp system arm at 5-10 degrees?
so you can click in goldmanns probe so that it will be perpendicular with the corneal plane
pulsating mires is caused by what?
venous pulsation causing lateral motion of mires. if mires come and go this is not pulsating mires, this means you have not adequately applanated the cornea
