ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting Questions and Answers

Question 1

A patient complains that the bottom edge of their new glasses is touching their cheeks, especially when they smile. Which of the following adjustments is the most effective first step to resolve this issue?

Accepted Answer

Decrease the pantoscopic tilt.

Answer

Decreasing the pantoscopic tilt (making the frame front more vertical) will move the bottom edge of the frame away from the patient's cheeks. Increasing face form, widening nose pads, or lengthening temples will not effectively address this specific problem.

Question 2

In the standard boxing system for frame measurements, what does the 'A' measurement represent?

Accepted Answer

The horizontal width of the lens box.

Answer

The 'A' measurement, often called the eye size, represents the widest horizontal dimension of the imaginary box drawn around the lens shape. The 'B' measurement is the vertical depth, and the DBL is the distance between lenses.

Question 3

When fitting a patient for a traditional flat-top (D-seg) bifocal, the segment height is most commonly measured from the bottom edge of the lens to which landmark?

Accepted Answer

The lower eyelid margin.

Answer

For a standard lined bifocal, the top of the segment line is typically placed at the level of the patient's lower eyelid margin. This positioning allows for clear distance vision when looking straight ahead and easy access to the near segment with a slight downward gaze.

Question 4

An optician needs to create 2 prism diopters of base-out (BO) prism in a right lens with a power of -4.00 DS. How many millimeters, and in which direction from the patient's PD, must the lens's optical center (OC) be decentered?

Accepted Answer

5 mm temporally

Answer

Using Prentice's Rule (Prism = Power x Decentration(cm)), we rearrange to find decentration: Decentration(mm) = (Prism x 10) / Power. Decentration = (2 x 10) / 4 = 5 mm. For a minus lens, the OC is moved in the same direction as the desired base. To achieve base-out, the OC must be moved out, or temporally.

Question 5

According to the ANSI Z80.1-2020 standard, what is the tolerance for sphere power on a finished single vision lens with a power of -4.50 D?

Accepted Answer

± 0.13 D

Answer

The ANSI Z80.1-2020 standard specifies a tolerance of ±0.13 D for sphere powers between +6.50 D and -6.50 D. Since -4.50 D falls within this range, this is the acceptable tolerance.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting Questions and Answers