Tonometry

Question 1

What are the two tonometry methods?

Answer 1

Indentation of cornea and flattening of cornea

Question 2

Goldman applanation tonometry is based on what principle?

Answer 2

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

Question 3

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

Answer 3

Too thick - overestimated

Too thin - underestimated

Question 4

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

Answer 4

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

Question 5

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

Answer 5

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

Question 6

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

Answer 6

the tonometer pushes aqueous out of the anterior chamber

Question 7

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

Answer 7

Anxiety
pressing on globe
Too tight shirt collar

Question 8

What is the gold standard for IOP measurement?

Answer 8

Goldman applanation tonometry