ANSI Z80.1 Standards and Tolerances 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.
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According to ANSI Z80.1, what is the power tolerance for a single-vision lens with a prescribed sphere power of -6.00 D?
Answer: ±0.12 D
For lenses with a vertex power greater than 6.50 D, the tolerance is ±2% of the prescribed power, but for -6.00 D the standard ±0.12 D tolerance applies.
What is the ANSI Z80.1 tolerance for cylinder axis when the cylinder power is between 0.75 D and 1.50 D?
Answer: ±3 degrees
ANSI Z80.1 specifies ±3 degrees of axis tolerance when the cylinder power falls between 0.75 D and 1.50 D.
Under ANSI Z80.1, what is the maximum allowable unwanted prism for a lens with a prescribed power of -2.00 D sphere at the distance reference point?
Answer: 0.33Δ
ANSI Z80.1 allows a maximum of 0.33Δ of unwanted prism at the distance reference point for lenses up to ±3.37 D.
Which ANSI Z80.1 standard governs prescription ophthalmic lenses?
Answer: ANSI Z80.1-2015
ANSI Z80.1 specifically covers prescription ophthalmic lenses, including tolerances for power, prism, and optical quality.
What is the ANSI Z80.1 tolerance for the add power of a progressive addition lens?
Answer: ±0.12 D
ANSI Z80.1 specifies ±0.12 D tolerance for the add power of progressive addition lenses.
According to ANSI Z80.1, what is the cylinder axis tolerance when prescribed cylinder power is greater than 1.50 D?
Answer: ±2 degrees
For cylinder powers exceeding 1.50 D, ANSI Z80.1 tightens the axis tolerance to ±2 degrees.
Under ANSI Z80.1, the minimum lens thickness for impact-resistant lenses made of glass should be no less than:
Answer: 2.0 mm at the thinnest point
ANSI Z80.1 requires glass dress ophthalmic lenses to be a minimum of 2.0 mm thick at the thinnest point for impact resistance.