Tonometry

In the measurement of intraocular pressure (IOP) with the Goldmann applanation tonometer, the intraocular pressure is indicated by a number on the calibrated dial. This reading is multiplied by what number to express the IOP in millimeters of mercury? 1. 2 2. 5 3. 10. 4. 20

10

If the upper eyelid is resting on the applanation tonometer tip, which of the following is not likely? 1. The pressure will be underestimated 2. The pressure will be overestimated 3. An accurate reading will be obtained 4. The mires will be distorted

An accurate reading will be obtained

Which of the following has no effect upon the intraocular pressure reading obtained with the Goldmann applanation tonometer? 1. Corneal astigmatism 2. Corneal thickness 3. External pressure on the eye from the examiners fingers 4. A tight collar or necktie

Corneal astigmatism

Which of the following variables can affect an applanation tonometry measurement? 1. Height of the patient 2. Gender of the patient 3. Corneal thickness 4. Anterior chamber depth

Corneal thickness

The examiner is preparing to measure intraocular pressure with the Goldmann applanation tonometer. Which of the following must be instilled into the eye, along with the topical anesthetic? 1. Rose bengal 2. Fluorescein 3. Lissamine green 4. Gentian violet

Fluorescein

What is a potential disadvantage of using the Schiotz tonometer in a highly myopic eye? 1. The patient will squint because the instrument is in focus as it approaches the eye 2. Myopic eyes are prone to corneal abrasions from the tip 3. Intraocular pressure will be underestimated due to low scleral rigidity 4. Intraocular pressure will be overestimated due to high scleral rigidity

Intraocular pressure will be underestimated due to low scleral rigidity

What is a way the air puff tonometer differs from the Goldmann tonometer? 1. It is an indentation tonometer 2. It uses a red stain on the cornea 3. It is a non contact approach 4. It always reads lower

It is a non contact approach

What is a disadvantage of the Goldmann applanation tonometer? 1. It is not standardized 2. It is not portable 3. It is hard to sterilize 4. Reproducibility of readings is poor

It is not portable

Which of the following is not an application tonometer? 1. Tono-Pen tonometer 2. Perkins tonometer 3. MacKay-Marg tonometer 4. Schiotz tonometer

Schiotz tonometer

Which of the following tonometers does not provide a direct pressure reading in mm Hg? 1. Schiotz tonometer 2. Goldmann tonometer 3. Tono-Pen tonometer 4. Air-puff tonometer

Schiotz tonometer

How should the plastic tip of an applanation tonometer be cleaned after use? 1. Wiped with a clean tissue 2. Soaked in 5% boric acid solution for 5 minutes, rinsed, and allowed to dry 3. Soaked in a 1:10 solution of household bleach, rinsed, and allowed to dry 4. Boiled for 3 minutes in sterile water

Soaked in a 1:10 solution of household bleach, rinsed, and allowed to dry

A patient is tending to squeeze the eye shut during applanation tonometry. Which of the following is most likely to result in satisfactory pressure readings? 1. Explain to the patient the importance of keeping the eye open 2. Insert a speculum to keep the eye open 3. Hold both eyelids open with one hand 4. Use a cotton-tipped applicator to gently elevate the upper eyelid

Use a cotton-tipped applicator to gently elevate the upper eyelid