Flashcards in Tonometry Deck (8)
What are the two tonometry methods?
Indentation of cornea and flattening of cornea
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
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
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
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
Why do you have to wait 10 seconds between repeated tonometry measurements?
the tonometer pushes aqueous out of the anterior chamber
What are some factors that contribute to a falsely high IOP reading?
pressing on globe
Too tight shirt collar