Trivia 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 Trivia flashcards as text
What is the Prentice Rule formula used to calculate prism in opticianry?
Answer: Prism (Δ) = Power (D) × Decentration (cm)
Prentice's Rule states that prism (in prism diopters) equals the lens power (in diopters) multiplied by the decentration (in centimeters).
Which segment style bifocal provides the widest near reading area?
Answer: Executive (E-style) bifocal
The Executive (E-style or Franklin-style) bifocal has a full-width segment that spans the entire lens width, providing the widest near zone.
What does 'photochromic' mean in the context of ophthalmic lenses?
Answer: The lens darkens in UV light and clears indoors
Photochromic lenses contain molecules that reversibly darken when exposed to UV radiation and return to a clear state when UV is removed indoors.
In the ANSI Z80.1 standard, what is the tolerance for sphere power for a lens with a power of -4.00 D?
Answer: ±0.12 D
ANSI Z80.1 allows ±0.12 D sphere power tolerance for lenses with powers between 0.00 and -6.50 D.
A patient's near PD is 62 mm and distance PD is 66 mm. What is each eye's near monocular PD if the eyes converge symmetrically?
Answer: 31 mm each
Near PD of 62 mm divided by 2 equals 31 mm per eye, representing symmetric convergence from distance to near.
What material property describes a lens's resistance to impact, critical for safety eyewear standards?
Answer: Impact resistance
Impact resistance describes a lens material's ability to absorb and withstand sudden force without fracturing, which is essential for safety eyewear compliance (ANSI Z87.1).
What is the term for the angle formed between the front plane of a frame and the plane of the lens, viewed from above?
Answer: Face form angle
The face form angle (also called face-form wrap) is the horizontal curvature of the frame as viewed from above, affecting how the lens wraps around the face.