lecture 9 applanation tonometry troubleshooting

Question 1

between the tonopen and tonopen XL, which is the one that you need to calibrate regularly by holding up and down

Answer 1

tonopen XL

Question 2

Both proparacaine and benoxinate have an onset of ____ and a duration of _____

Answer 2

15sec, 15minutes

Question 3

(T or F) A “toemark” is a serious injury

Answer 3

false, but if you left a toe mark you could give the pt some artificial tears

Question 4

(T or F) Hand held Perkins contains a doubling prism and acts similarly to Goldman tonometry.

Answer 4

true

Question 5

If pt is allergic to novocaine, is it safe to use proparacaine?

Answer 5

YES

Question 6

After GAT when do you recommend pt’s to wear their CL’s?

Answer 6

30-60 minutes

Question 7

How do you ensure GAT probe is perpendicular to the cornea surface?

Answer 7

by offsetting mounting arm angle

Question 8

what are the 3 basic components of the applanation tonometer 900?

Answer 8

1) probe 2) spring loaded probe holder 3) measuring drum

Question 9

What is the area of central cornea applanation?

A) 4.25mm2
B) 5.35mm2
C) 6.55mm2
D) 7.35mm2

Answer 9

D) 7.35mm2

Question 10

If you turn the GAT drum toward the patient, the semicircles get:

A) smaller
B) larger
C) closer
D) farther

Answer 10

C) closer

Question 11

Your pt has small eyes and you are having difficulty performing tonometry. You try to lift the upper lid. What do you need to be careful of?

Answer 11

do not apply pressure on the globe while doing this, it will affect your IOP reading

Question 12

An asymmetrical IOP reading between the 2 eyes is a difference of ______ mmHg or greater

Answer 12

3mmHg, repeat GAT if this happens