GAT Flashcards
1
Q
What is the IOP derived from in GAT
A
Force required to flatten an area of 3.06mm diameter
IOP = Force applied + tear film force -
/ Area
2
Q
What is the head of tonometer made of?
A
Split field prism
3
Q
What does it mean when the mires are too far appart
A
Applanation area is too small 0 need more forceW
4
Q
What does it mean when the mires are too close to eachother
A
Need to apply less force
5
Q
What are causes of overestimation of IOP
A
TOO MUCH fluorescein
TOO THICK cornea
ASTIGMATISM
CORNEA SCAR
6
Q
What are causes of underestimation of IOP
A
INADEQUATE FLUORESCEIN
THIN CORNEA
ASTIGMATISM
CORNEAL OEDEMAh
7
Q
What is a Perkins tonometer
A
Uses split prism
Requires fluorescein
Can be used with pt upright or supine
Portable
