Spectacle Dispensing and Fitting Flashcards
7 cards from real ABO NOCE Basic Opticianry practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Spectacle Dispensing and Fitting flashcards as text
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:
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.
When dispensing a new patient with a significant prescription change, the optician should advise them to:
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.
The 'boxing system' measurement called 'A' refers to:
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.
Which of the following frame materials is MOST resistant to heat adjustment?
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.
Retroscopic tilt (as opposed to pantoscopic tilt) means the top of the frame is:
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.
A patient who wears a +4.00D lens needs a vertex distance adjustment from 12mm to 16mm. The effective power will:
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.
When fitting a child with spectacles, which consideration is MOST critical compared to fitting adults?
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.