ABO NOCE Basic Opticianry Dispensing Instrumentation 5

Question 1

If a lensometer reading shows the sphere drum at +2.00 and the cylinder drum at +0.75 at axis 90, the lens power in minus-cylinder form is:

Accepted Answer

+2.75 -0.75 × 180

Answer

Converting plus-cylinder lensometer readings to minus-cylinder: add sphere+cylinder to get the new sphere (+2.75), change cylinder sign (-0.75), and rotate axis 90° (180).

Question 2

The three ink dots made by a lensometer dotting device on a finished lens represent:

Accepted Answer

The optical center (center dot) and reference points for horizontal axis alignment (outer dots)

Answer

The center dot marks the optical center and the two outer dots establish the horizontal meridian used to properly align the lens during edging.

Question 3

An ultrasonic cleaner in an optical dispensary is used to:

Accepted Answer

Clean frames and lenses using high-frequency sound waves in a cleaning solution

Answer

Ultrasonic cleaners use high-frequency vibrations in a liquid solution to remove skin oils, debris, and contaminants from frames and lenses without abrasion.

Question 4

When using a frame warmer on a metal frame with plastic temples, the optician should:

Accepted Answer

Use only the hot-air blower on the plastic portions and use pliers for metal adjustments

Answer

Plastic temple tips and components can be softened with a hot-air blower, while metal frame parts are adjusted with appropriate pliers rather than direct heat.

Question 5

A temple-bending iron (or angling pliers) is used to create or adjust which frame feature?

Accepted Answer

The drop (angle) at the bend where the temple transitions behind the ear

Answer

A temple-bending iron or angling pliers adjusts the earpiece bend angle and drop to ensure proper fit behind and over the patient's ear.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Dispensing Instrumentation 5