ABO NOCE Basic Opticianry Spectacle Dispensing Procedures Questions and Answers 2

Question 1

When dispensing progressive addition lenses (PALs), the fitting cross should be positioned:

Accepted Answer

At the center of the pupil when the patient looks straight ahead in natural primary gaze

Answer

The progressive lens fitting cross (or fitting point) must align with the pupil center in primary gaze to ensure the patient looks through the correct zone of the lens for each distance.

Question 2

What is the significance of the 'corridor length' in progressive addition lenses?

Accepted Answer

It is the vertical length of the progressive channel from distance zone to full add power; shorter corridors need more head movement

Answer

The corridor length is the vertical pathway of progressive power change from the distance reference point to the near reference point. Shorter corridors give less head movement but narrower zones.

Question 3

The minimum fitting height for most standard progressive addition lenses is approximately:

Accepted Answer

18–22 mm

Answer

Standard progressive lenses require a minimum fitting height of approximately 18–22 mm to accommodate the full corridor from distance to near zones.

Question 4

When verifying the optical center placement of a dispensed pair of glasses, the optician should check:

Accepted Answer

That the OC height matches the prescribed seg/OC height and the horizontal decentration matches the patient's PD

Answer

Verification must confirm that optical centers are placed at the correct height and horizontal position (per patient PD) per ANSI Z80.1 standards.

Question 5

Which of the following is the correct way to adjust the temple length on a metal frame?

Accepted Answer

Heat the temple bend area and reshape to move the bend point closer or farther from the hinge to change the length behind the ear

Answer

Temple length adjustment on metal frames involves heating the bend point and reshaping — moving the bend forward (shortening) or backward (lengthening) to fit the distance behind the patient's ear.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Spectacle Dispensing Procedures Questions and Answers 2