ABO NOCE Basic Opticianry Spectacle Dispensing Procedures Questions and Answers

Question 1

What is the primary optical reason for incorporating a standard pantoscopic tilt of approximately 8-12 degrees when fitting spectacles?

Accepted Answer

To maintain the correct optical axis of the lens for both distance and near vision through the tilted lens.

Answer

To increase the effective vertex distance, which strengthens the power of plus lenses.

Answer

To lower the optical centers of the lenses, inducing base-down prism for reading.

Answer

To bring the bottom of the frame front closer to the face, improving the cosmetic appearance.

Question 2

A new optician is fitting a patient with their first pair of progressive addition lenses (PALs). Where should the fitting cross of the PAL be measured and marked in relation to the patient's eye?

Accepted Answer

Directly centered over the pupil while the patient looks straight ahead in their natural posture.

Answer

At the lower limbus of the iris while the patient is in their natural head posture.

Answer

Exactly halfway between the pupil and the lower eyelid margin.

Answer

Directly centered over the pupil while the patient's head is tilted slightly back to simulate a reading position.

Question 3

When using the boxing system for frame measurements, which of the following is defined as the 'A' measurement?

Accepted Answer

The horizontal width of the lens box.

Answer

The vertical depth of the lens box.

Answer

The distance between the two lenses (bridge size).

Answer

The effective diameter of the lens shape.

Question 4

A patient returns with new single-vision glasses complaining that straight lines, like door frames, appear curved or bowed inward. This 'pincushion' distortion is most commonly associated with which type of lens power?

Accepted Answer

High plus (hyperopic) spherical lenses.

Answer

High minus (myopic) spherical lenses.

Answer

Lenses with significant astigmatic correction.

Answer

Low power spherical lenses of any sign.

Question 5

According to ANSI Z80.1-2020 standards for mounted spectacle lenses, what is the tolerance for cylinder axis for a prescription with a cylinder power of -1.00 D?

Accepted Answer

± 3 degrees

Answer

± 7 degrees

Answer

± 5 degrees

Answer

± 2 degrees

Question 6

When measuring the segment height for a patient being fitted with a Flat-Top 28 (FT-28) bifocal, which of the following landmarks is the standard reference point to measure to?

Accepted Answer

The upper edge of the lower eyelid.

Answer

The center of the pupil.

Answer

The lower limbus (edge of the iris).

Answer

A point 3 mm below the pupil center.