FREE CPO Ophthalmic Instrument Maintenance and Calibration Questions and Answers

Question 1

How is the calibration of a Goldmann applanation tonometer checked?

Accepted Answer

Using a standardized calibration bar at the 0, 2, and 6 positions

Answer

By comparing its reading to an electronic tonometer

Answer

By measuring the pressure of a known saline-filled model eye

Answer

Sending it to the manufacturer for annual service

Question 2

What is the first and most critical step before using a manual lensometer to ensure an accurate reading?

Accepted Answer

Focusing the eyepiece

Answer

Wiping the lens stop with an alcohol pad

Answer

Turning on the marking pins

Answer

Setting the power wheel to zero

Question 3

When changing the bulb in a slit lamp or projector, what is the most important precaution to take with the new bulb?

Accepted Answer

Avoid touching the glass portion of the bulb with bare hands

Answer

Ensure the power is on to check for a good connection

Answer

Wipe the bulb with an alcohol prep pad before installation

Answer

Tighten the bulb as much as possible to secure it

Question 4

Which solution is generally NOT recommended for cleaning the lens surfaces of a phoropter (manual refractor)?

Accepted Answer

Alcohol

Answer

Approved ophthalmic lens cleaner

Answer

Distilled water

Answer

A soft, lint-free microfiber cloth

Question 5

To ensure accurate readings from a keratometer, what part of the instrument must be kept clean and unobstructed?

Accepted Answer

The mires

Answer

The joystick base

Answer

The forehead rest

Answer

The occluder

Question 6

What is a standard daily maintenance procedure for automated instruments like an autorefractor or non-contact tonometer?

Accepted Answer

Wiping down the chinrest and forehead rest with a disinfectant

Answer

Disassembling the internal optics for cleaning

Answer

Recalibrating the measurement prism

Answer

Updating the device's software