Tonometry Flashcards Preview

PPO 1b > Tonometry > Flashcards

Flashcards in Tonometry Deck (8)
Loading flashcards...
1

What are the two tonometry methods?

Indentation of cornea and flattening of cornea

2

Goldman applanation tonometry is based on what principle?

Imbert-Fick principle. Pressure inside a sphere is equal to the force necessary to flatten surface divided by the area

3

If the tonometery mires are too thick, IOP will ______ while if the tonometry mires are too thin, IOP will be _____

Too thick - overestimated
Too thin - underestimated

4

What does it mean if the space inside the semicircle mires are splotchy and indistinct?

Too much pressure is being applied. Pull back slightly on joystick

5

Thicker corneas result in falsely ____ IOP measurements while thinner corners result in falsely ____ Iop measurements

thick - falsely high
thin - falsely low
*exception* thick due to water

6

Why do you have to wait 10 seconds between repeated tonometry measurements?

the tonometer pushes aqueous out of the anterior chamber

7

What are some factors that contribute to a falsely high IOP reading?

Anxiety
pressing on globe
Too tight shirt collar

8

What is the gold standard for IOP measurement?

Goldman applanation tonometry