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OptiCampus ANSI Z80.1-2010 Summary

This is a summary of the principal optical and geometrical tolerances from the new ANSI Z80.1-2010, American National Standard for Ophthalmics—Prescription Ophthalmic Lenses. This includes both mounted and unmounted tolerances for single vision & bifocal lenses and progressive addition lenses. The full version of this document is available online from ANSI's eStandards Store. OptiCampus highly recommends obtaining the full Z80.1 Standard, which includes useful definitions, test methods, and informative annexes.

General Tolerances for Single Vision and Multifocal Lenses
Measurement Power Range Tolerance
Sphere Power ≥ 0.00 D, ≤ ±6.50 D
> ±6.50 D
±0.13 D
±2%
Cylinder Power ≥ 0.00 D, ≤ 2.00 D
> 2.00 D, ≤ 4.50 D
> 4.50 D
±0.13 D
±0.15 D
±4%
Cylinder Axis > 0.00 D, ≤ 0.25 D
> 0.25 D, ≤ 0.50 D
> 0.50 D, ≤ 0.75 D
> 0.75 D, ≤ 1.50 D
> 1.50 D
±14°
±7°
±5°
±3°
±2°
Add Power ≤ +4.00 D
> +4.00 D
±0.12 D
±0.18 D
Unmounted Prism and PRP ≥ 0.00 D, ≤ ±3.37 D
> ±3.37 D
0.33 Δ
1.0 mm
Vertical Prism Imbalance ≥ 0.00 D, ≤ ±3.37 D
> ±3.37 D
±0.33 Δ Total
±1.0 mm Difference
Horizontal Prism Imbalance ≥ 0.00 D, ≤ ±2.75 D
> ±2.75 D
±0.67 Δ Total
±2.5 mm Total
Vertical Segment Height   ±1.0 mm Each
Vertical Segment Difference   1.0 mm Difference
Horizontal Segment Location   ±2.5 mm Total
Horizontal Segment Tilt   ±2.0°
General Tolerances for Progressive Addition Lenses
Measurement Power Range Tolerance
Sphere Power ≥ 0.00 D, ≤ ± 8.00 D
> ± 8.00 D
±0.16 D
±2%
Cylinder Power ≥ 0.00 D, ≤ 2.00 D
> 2.00 D, ≤ 3.50 D
> 3.50 D
±0.16 D
±0.18 D
±5%
Cylinder Axis > 0.00 D, ≤ 0.25 D
> 0.25 D, ≤ 0.50 D
> 0.50 D, ≤ 0.75 D
> 0.75 D, ≤ 1.50 D
> 1.50 D
±14°
±7°
±5°
±3°
±2°
Add Power ≤ 4.00 D
> 4.00 D
±0.12 D
±0.18 D
Unmounted Prism and PRP ≥ 0.00 D, ≤ ±3.37 D
> ±3.37 D
0.33 Δ
1.0 mm
Vertical Prism Imbalance ≥ 0.00 D, ≤ ±3.37 D
> ±3.37 D
±0.33 Δ Total
1.0 mm Difference
Horizontal Prism Imbalance ≥ 0.00 D, ≤ ±3.37 D
> ±3.37 D
±0.67 Δ Total
±1.0 mm Each
Vertical Fitting Point Height   ±1.0 mm Each
Vertical Fitting Point Difference   1.0 mm Difference
Horizontal Fitting Point Location   ±1.0 mm Each
Horizontal Axis Tilt   ±2.0°
Additional Mechanical Tolerances
Measurement Comment Tolerance
Center Thickness When Specified ±0.3 mm
Base Curve When Specified ±0.75 D
Segment Size For Multifocals ±0.5 mm
Warpage   1.00 D