ABO NOCE Basic Opticianry Dispensing Instrumentation Questions and Answers 2

Question 1

When using a frame tracer (frame pattern maker), what information is captured for use by an edger?

Accepted Answer

The exact shape (silhouette) of the lens opening, including its size, position, and geometric center

Answer

A frame tracer digitally captures the lens shape from the frame (or demo lens), producing a data file used by the edger to cut the lens to the exact required shape.

Question 2

An optical bench is used to measure:

Accepted Answer

The focal length and optical properties of lens systems, including back vertex distance and focal power

Answer

An optical bench is a laboratory instrument for measuring lens system properties including focal lengths, vergence, and back vertex power with precision.

Question 3

The purpose of a segment height gauge (seg height ruler) is to:

Accepted Answer

Measure the vertical distance from the lowest point of the lens to the top of the bifocal segment

Answer

A seg height gauge measures the height of the bifocal or progressive addition segment from the bottom of the lens, used to verify correct placement per the dispensing prescription.

Question 4

What is the function of a spectacle frame warmer (frame heater)?

Accepted Answer

To heat plastic frames to make them pliable for adjustment and lens insertion

Answer

Frame warmers (salt pans, hot air, or bead warmers) heat plastic frames to 60–80°C, making the material soft enough to safely adjust the frame and insert or remove lenses without cracking.

Question 5

The purpose of a thickness caliper in opticianry is to:

Accepted Answer

Measure lens center thickness and edge thickness to verify they meet ANSI Z80.1 minimum thickness requirements

Answer

Thickness calipers measure the center and edge thickness of finished lenses to ensure they meet minimum thickness requirements per ANSI Z80.1 and are safe for dispensing.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Dispensing Instrumentation Questions and Answers 2