6.1 Tonometry

Question 1

Difference between tonometry and applanation

Answer 1

Tonometry is the umbrella term: meaning any device to check IOP. VS. Applanation is a specific form of tonometry (the cornea is flattened or applanated)

Question 2

4 steps of aqueous flow

Answer 2

1. Cilliary body makes the aqueous 2. It flows to pupil 3. Then up to anterior chamber 4. Drains through trabecular meshwork of angle

Question 3

High IOP comes from too little drainage or too much fluid being made

Answer 3

Too little drainage

Question 4

Normal range of IOP

Answer 4

10-22mmHG

Question 5

If top mire on goldmann applanation tonometry is too far LEFT, the IOP your currently at is

Answer 5

Too low: increase it

Question 6

If top mire on goldmann applanation tonometry is too far RIGHT, the IOP your currently at is

Answer 6

Too high: decrease it

Question 7

Too thick of mires means

Answer 7

IOP reads falsely high

Question 8

Too thin of mires means

Answer 8

IOP reading is falsely low

Question 9

Common things that make an IOP raise

Answer 9

thick cornea, steroid gtts, time (midnight to 7am), pt holding breath, striking, squeezing lids

Question 10

Schiotz Tonometry

Answer 10

indentation (push beyond flattening at cornea), weighted, pt laying down, needs conversion chart

Question 11

What is the unit of measurement of IOP?

Answer 11

MmHG stands for millimeters of Mercury

Question 12

Applanation vs indentation

Answer 12

Applanation = flatten to take pressure VS Indentation= press so far in the cornea goes from concave to convex (backwards U formation)

Question 13

Only IOP what’s indentation and uses chart to covert numbers to read a pressure (very old method no longer used)

Answer 13

Schiotz Indentation

*this is total BULL SHIOTZ with this chart to convert and indent a cornea