lecture 8 tonometry

Question 1

aqueous humor is produced by_____ and controlled by _____

Answer 1

posterior chamber, carbonic anhydrase

Question 2

glaucoma therapy focuses on which 2 mechanisms of increased IOP?

Answer 2

increasing outflow and inhibition of production

Question 3

what are the 2 aqueous humor outflow routes?

Answer 3

trabecular (70%), uveoscleral (30%)

Question 4

Do prostaglandins effect outflow or production of aqueous humor?

Answer 4

outflow

Question 5

what is the MOST SIGNIFICANT factor in the etiology of increased IOP?

Answer 5

interference with aqueous outflow

Question 6

(T or F) Non-contact tonometry (nct) is considered applanation tonometry?

Answer 6

true

Question 7

(T or F) With applantation tonomtery, repeated reading will change IOP

Answer 7

false, however, with indention tonometry repeated reading would increase IOP

Question 8

The avg corneal thickness is______

Answer 8

520 microns

Question 9

diameter of applanation is______

Answer 9

3.06mm

Question 10

area of applanation is_______

Answer 10

7.35mm

Question 11

what is the “gold standard” of tonometry

Answer 11

goldmann tonometry

Question 12

On the goldmann tonometry dial, each small mark is equal to ____

Answer 12

2mmHg

Question 13

name 3 types of common diagnostic agents

Answer 13

anesthetics, cycloplegics, mydriatics

Question 14

(T or F) patients may have a cross-sensitivity to Fluress if they have ever had an adverse reaction to novocaine

Answer 14

true

Question 15

(T or F) patients may have a cross-sensitivity to proparacaine if they have ever had an adverse reaction to novocaine

Answer 15

false, if they are allergic to novocaine they will have cross sensitivity to fluress and proparacaine would be the alternative for that patient

Question 16

On the Haag streit AT900, what does A and O mean

Answer 16

A=astigmatism, O=sphere

Question 17

For the goldman tonometry, if K cyl is >4.00D, then measurement must be made ____ degrees from the meridian of thhe lower power

Answer 17

43 degrees

Question 18

what is the separation in degrees of the white and red lines on the Goldmann tonometer?

Answer 18

43 degrees

Question 19

To set up for goldmann tonometry:polarized filter is ____, mag is _____, illuminaion is ____

Answer 19

off, 10x-16x, high

Question 20

Why do you want to put the sit lamp system arm at 5-10 degrees?

Answer 20

so you can click in goldmanns probe so that it will be perpendicular with the corneal plane

Question 21

pulsating mires is caused by what?

Answer 21

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