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COT > Tonometry 3% > Flashcards

Tonometry 3% Flashcards

1
Q

What principle is the application tonometry based on?

A

Imbert-Fick Principle

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2
Q

What is the Imbert-Fick principle?

A

The pressure inside a thin-walled sphere=the force necessary to flatten its surface divided by the area of flattening.

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3
Q

What is the formula for Imbert-Fick Prinicplr?

A

P=F/A

P= Pressure
F=Force
A=Area

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4
Q

In applanation tonometry pressure is determined by the amount of weight required to flatten the cornea _____mm

A

3.06mm

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5
Q

______and ______are factored into formula for Goldmann applanation principle.

A

K rigidity
Surface tension

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6
Q

Tip of Goldmann is designed to minimize ______pull from tear film and _____push from K.

A

Inward
Outward

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7
Q

This form of tonometry is very accurate, has minimal effect from repeats measurements.

A

Goldmann

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8
Q

Goldmann applanation principle formula is based on _______mcm thick K

A

550

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9
Q

_________used for thinner and thicker K’s

A

Namograms

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10
Q

What are the advantages of Goldmann?

A

Most accurate, reproducible

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11
Q

What is the most accurate tonometry test?

A

Goldmann

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12
Q

What are the disadvantages to Goldmann?

A

Requires training, subjective to breath holding, tight collars, and pressure on the globe, not portable, requires anesthetic, poor technique can cause K injury

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13
Q

The following products/procedures for disinfection will _________the tip causing it to _______: alcohol, Acetone, UV radiation, Sterilization, immersion in fluid for more than 1 hour, storing at temp greater than 60C

A

Degrade
Fail

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14
Q

What do you clean the tip of Goldmann with?

A

Hydrogen peroxide

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15
Q

Never leave the Goldmann tip in hydrogen peroxide for more than _______minutes

A

10

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16
Q

70% Isopropyl Alcohol will _____the probes of Goldmann and if not _____properly can cause marked pain and anterior uveitis.

A

Destroy
Dried

17
Q

A side view of the Tonometry probe-set the axis to _____degrees.

A

180

18
Q

*If pt has_______cyl position the probe on Goldmann with the red line at the corresponding minus cyl axis of K astig

A

Greater than or equal to 3D

19
Q

Where should the drum be set when starting Goldmann?

A

at 10

20
Q

Each mark on the drum of Goldman tip represents…..

A

2 mm Hg

21
Q

When doing Goldmann the light source should be place at what degree?

A

60-65 degrees

22
Q

When doing Goldmann what should the light setting be?

A

Use wide open diffuse illumination, bright illumination, the cobalt blue filter and 10 or 12x magnification

23
Q

When doing Goldmann you should approach the cornea with your _______

A

naked eye

24
Q

When doing Goldmann you should look through the ______when you are almost on the cornea.

A

oculars

25
Q

What are the steps in doing Goldmann once you have got it lined up, lights and magnification adjusted and you are now looking through the oculars?

A

Judge mire thickness, Adjust alignment of mires horizontally and vertically, check for proper forward pressure on the eye “the sweet spot”, measure IOP.

26
Q

*In Goldmann, If mires are too thick what should you do?

A

Have pt blot closed eyes with tissue

27
Q

In Goldmann if mires are too thin what should you do?

A

Add more dye.

28
Q

In Goldmann, if mires are too_______ the pressure will be overestimated.

A

Fat

29
Q

In Goldmann, If the mires are too ______ the IOP will be underestimated.

A

thin

30
Q

What should you do if mires are too thick when doing Goldmann?

A

Pull the slit lamp back, dry off the end of the prism tip , have pt blot closed eyes, start over.

31
Q

*What is the likely cause of mires being too fat when doing Goldmann?

A

lashes in contact with the probe, too much Fluress ore excessive tearing

32
Q

How should you hold lids when doing Goldmann?

A

By pressing on the orbital rim, do not put pressure on the globe itself.

33
Q

What is the usual variation in IOP over a 24 hour period?

A

3-5 mmHg

34
Q

*What time of day is the highest IOP reading?

A

Approx 6am

35
Q

Pressure spikes that are ____ are diagnostic.

A

> 5mmHg

36
Q

What should you do for your CL pt to do if you have done Goldmann?

A

Soft: Irrigate eyes with sterile irrigating solution to remove all fluorescein. Advise pt not to wear their CL for at least 1 hour, lenses will absorb Fluorescein turning them yellow.
Hard: Advise pt not to wear their lenses as long as they normally would. Topical anesthetics soften K epithelium makin an abrasion more likely.

COT (28 decks)

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