Table 3.
The ABCD grading system; Scarring – clear, no scarring (−), scarring, iris details visible (+), scarring, iris obscured (++).
| ABCD criteria | A | B | C | D | Scarring |
|---|---|---|---|---|---|
| Anterior Radius of Curvature (ARC) 3.0 mm zone | Posterior Radius of Curvature (PRC) 3.0 mm zone | Thinnest Pachymetry | Best Corrected Distance Visual Acuity (BDVA) | ||
| 0 | > 7.25 mm (< 46.5 D) | > 5.90 mm | > 490 | ≥20/20 (≥1.0) | - |
| 1 | > 7.05 mm (< 48.0 D) | > 5.70 mm | > 450 | < 20/20 (< 1.0) | −, +, ++ |
| 2 | > 6.35 mm (< 53.0) | > 5.15 mm | > 400 | < 20/40 (< 0.5) | −, +, ++ |
| 3 | > 6.15 mm (< 55.0 D) | > 4.95 mm | > 300 | < 20/100 (< 0.2) | −, +, ++ |
| 4 | < 6.15 mm (> 55.0 D) | > 4.95 | ≤ 300 | < 20/400 (< 0.05) | −, +, ++ |