ABO NOCE MCQ 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 ABO NOCE MCQ flashcards as text
A patient's prescription reads +2.50 -1.25 x 090. What is the sphere power of the lens?
Answer: +2.50 D
The sphere power is the first number in the prescription notation, which is +2.50 D.
Which lens design is best suited for a patient who needs to read music on a stand while playing an instrument?
Answer: Occupational progressive lens
Occupational progressives are designed for intermediate-dominant tasks, providing a wider intermediate zone ideal for music stand distances.
What does the term 'decentration' refer to in opticianry?
Answer: Moving the optical center away from the pupil center
Decentration is the intentional horizontal or vertical displacement of the optical center relative to the frame's geometric center.
A frame has a 'B' measurement of 38 mm and a DBL of 18 mm. What is the frame's 'A' measurement needed to calculate minimum blank size?
Answer: It cannot be determined from B and DBL alone
The 'A' measurement (lens width) is independent of B (lens height) and DBL (bridge width) and must be measured separately.
Which of the following coatings reduces reflections from the back surface of a lens to improve night driving vision?
Answer: Anti-reflective coating
Anti-reflective (AR) coating minimizes internal and external reflections, reducing halos and glare especially during night driving.
What is the effect on image size when minus lenses are used?
Answer: They minify the image
Minus (concave) lenses cause light to diverge, producing a smaller, virtual, and upright image — a minification effect.
A patient complains that their new single vision lenses cause the floor to appear to tilt. Which measurement error is most likely responsible?
Answer: Unequal optical center heights
Unequal optical center heights create vertical prismatic imbalance, causing spatial distortion that makes flat surfaces appear to tilt.