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Signet® - Trifocal 7x28 (Standard Index 1.498) 70mm Diameter Lens Blank Segment Displacement: 5mm in, 1mm down Adds are in 0.25 diopter steps from 1.50 to 3.00 |
| Nominal Curve | True Curve | Radius (mm) | SAG at 50 | Nominal Concave | Edge Thickness | Center Thickness |
| 2.00 | 2.03 | 6.75 | 14.5 | 8.0 | ||
| 4.25 | 4.11 | 6.75 | 11.0 | 8.0 | ||
| 6.25 | 6.22 | 6.75 | 11.0 | 10.3 | ||
| 8.25 | 8.38 | 6.75 | 7.5 | 10.3 |