ABO ABO Quality & Compliance 2 — Questions and Answers
Question 1: Under ANSI Z80.1 standards, the maximum allowable cylinder power tolerance for a lens with a prescribed cylinder of -2.00 D is:
- ±0.06 D
- ±0.09 D (Correct answer)
- ±0.12 D
- ±0.15 D
Correct answer: ±0.09 D
ANSI Z80.1 allows ±0.09 D cylinder power tolerance for cylinders between -2.00 D and -4.50 D.
Question 2: Which federal law requires that all prescription eyeglass lenses dispensed in the United States must be impact resistant unless the prescriber specifies otherwise?
- OSHA 29 CFR 1910.133
- FDA 21 CFR Part 801
- FTC Eyeglass Rule
- FDA 21 CFR Part 886 (Correct answer)
Correct answer: FDA 21 CFR Part 886
FDA 21 CFR Part 886 requires all dress eyeglass lenses to be impact resistant (e.g., polycarbonate or heat-treated glass).
Question 3: A patient's frame PD is 64 mm and the ordered monocular PDs are 33 OD / 29 OS. What is the total induced horizontal prism if the lens power is -4.00 D OU?
- 0.40 prism diopters OU (Correct answer)
- 0.80 prism diopters OU
- 1.60 prism diopters OU
- No prism is induced
Correct answer: 0.40 prism diopters OU
Each eye decenters 2 mm (64/2=32 vs 33 OD, 32 vs 29 OS gives 1 mm OD and 3 mm OS), with Prentice's rule yielding 0.4Δ OD and 1.2Δ OS—but checking: OD decenters 1 mm out → 0.4Δ BI; OS decenters 3 mm in → 1.2Δ BI; however standard tolerance applies per eye.
Question 4: The FTC Eyeglass Rule primarily protects consumers by requiring:
- Opticians to verify all prescriptions before dispensing
- Prescribers to provide a copy of the prescription at no charge after an eye exam (Correct answer)
- Optical labs to perform a 100% quality check on finished lenses
- Dispensers to offer a warranty on all eyewear sold
Correct answer: Prescribers to provide a copy of the prescription at no charge after an eye exam
The FTC Eyeglass Rule requires prescribers to give patients a copy of their eyeglass prescription automatically after an exam at no additional charge.
Question 5: OSHA's requirement for occupational eye protection (29 CFR 1910.133) mandates that protective eyewear must meet standards set by:
- ANSI Z87.1 (Correct answer)
- ANSI Z80.1
- ISO 8980-1
- ASTM F803
Correct answer: ANSI Z87.1
OSHA references ANSI Z87.1 as the accepted standard for occupational eye and face protection devices.
Question 6: When verifying a finished spectacle lens, the lensometer reading shows +2.25 -0.50 × 090. The prescription is +2.00 -0.75 × 090. Which ANSI Z80.1 tolerance is exceeded?
- Sphere power tolerance
- Cylinder power tolerance
- Axis tolerance
- Both sphere and cylinder tolerances (Correct answer)
Correct answer: Both sphere and cylinder tolerances
The sphere is off by +0.25 D (tolerance ±0.13 D for this power) and the cylinder is off by +0.25 D (tolerance ±0.09 D), so both are exceeded.
Question 7: A dispensary receives lenses with an unacceptable number of surface scratches. Under quality compliance best practices, the FIRST action should be:
- Dispense the lenses and notify the patient of the defect
- Return all affected lenses to the lab and document the issue (Correct answer)
- Apply an anti-scratch coating in-house to correct the defects
- File a complaint with the FDA immediately
Correct answer: Return all affected lenses to the lab and document the issue
Lenses with surface defects exceeding ANSI standards must be returned to the lab; the issue should be documented for quality tracking and corrective action.
ABO ABO Quality & Compliance 2
Under ANSI Z80.1 standards, the maximum allowable cylinder power tolerance for a lens with a prescribed cylinder of -2.00 D is: