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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 |
|
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