ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting 4 — Questions and Answers
Question 1: A patient's complaint is that one lens appears higher than the other when looking at their glasses from the front. This is most likely caused by:
- Unequal lens powers
- Facial asymmetry or uneven temple height (Correct answer)
- Incorrect PD measurement
- Wrong anti-reflective coating
Correct answer: Facial asymmetry or uneven temple height
Uneven lens height appearance is typically caused by facial asymmetry or temples adjusted to different heights, not the lens powers themselves.
Question 2: When dispensing a new patient with a significant prescription change, the optician should advise them to:
- Wear the old glasses alternately with the new ones
- Wear the new glasses full-time for adaptation (Correct answer)
- Return immediately if any discomfort occurs
- Expect the prescription to be wrong if discomfort lasts over 24 hours
Correct answer: Wear the new glasses full-time for adaptation
Wearing new glasses full-time allows the visual system to adapt most quickly; alternating between old and new glasses prolongs adaptation.
Question 3: The 'boxing system' measurement called 'A' refers to:
- The horizontal width of the lens opening (Correct answer)
- The vertical height of the lens opening
- The distance between lens centers
- The bridge size
Correct answer: The horizontal width of the lens opening
In the boxing system, 'A' is the horizontal width (lens width) measured at the widest horizontal point of the lens shape.
Question 4: Which of the following frame materials is MOST resistant to heat adjustment?
- Zyl (cellulose acetate)
- Optyl
- Nylon (polyamide) (Correct answer)
- Propionate
Correct answer: Nylon (polyamide)
Nylon (polyamide) frames have a high melting point and are highly resistant to heat, making them difficult to adjust with standard heat methods.
Question 5: Retroscopic tilt (as opposed to pantoscopic tilt) means the top of the frame is:
- Tilted toward the face
- Tilted away from the face (Correct answer)
- Perfectly vertical
- Wrapped around the face
Correct answer: Tilted away from the face
Retroscopic tilt means the top of the frame front tilts away from the face, which is generally undesirable and reduces optical performance.
Question 6: A patient who wears a +4.00D lens needs a vertex distance adjustment from 12mm to 16mm. The effective power will:
- Increase (more plus) (Correct answer)
- Decrease (less plus)
- Stay the same
- Become minus
Correct answer: Increase (more plus)
Increasing vertex distance for plus lenses increases the effective plus power experienced by the eye, as the lens moves farther from the cornea.
Question 7: When fitting a child with spectacles, which consideration is MOST critical compared to fitting adults?
- Using only metal frames
- Ensuring proper seg height for reading
- Verifying the frame will remain stable during activity (Correct answer)
- Selecting the lowest available power
Correct answer: Verifying the frame will remain stable during activity
Frame stability is critical for children because unstable or poorly fitted frames can interfere with amblyopia treatment, vision development, and lens effectiveness.
ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting 4
A patient's complaint is that one lens appears higher than the other when looking at their glasses from the front.
This is most likely caused by: