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

At the lower pupil margin

Answer

4 mm above the pupil center

Answer

At the top of the patient's iris

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

It is the horizontal width of the clear reading zone

Answer

It is the total optical height of the lens blank

Answer

It is the distance from the fitting cross to the top of the lens

Question 3

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

Accepted Answer

18–22 mm

Answer

10–12 mm

Answer

25–28 mm

Answer

14–16 mm

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

Only that the lenses are not scratched or chipped

Answer

That the frame fits correctly on the patient's face

Answer

Only the sphere power of each lens

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

Stretch the metal temple using pliers applied along the entire length

Answer

Replace the temples with longer or shorter ones only

Answer

Adjust the nose pads to compensate for temple length

Question 6

What is 'retroscopic tilt' and how does it affect the patient?

Accepted Answer

The top of the frame tilting toward the face (reverse of pantoscopic); it can cause unwanted oblique astigmatism and visual distortion

Answer

The frame tilting too far forward at the top (same as pantoscopic tilt)

Answer

A horizontal misalignment of the frame on the face

Answer

The angle of the temples relative to the frame front