Table 5
An example of manually scoring the astigmatism to produce a summary measure for statistical analysis. The actual steps in the magnitude may be altered to suit the clinical situation requiring analysis. Smaller increments maybe suitable when larger numbers of patients are involved
| Magnitude (D) | WTR (axis 60–120°) | ATR (axis 0–30, and 150–180°) | OBL (axis 30–59°, and 120–149°) |
| >6 | 20 | 21 | 22 |
| 5.25–6.00 | 17 | 18 | 19 |
| 4.25–5.00 | 14 | 15 | 16 |
| 3.25–4.00 | 11 | 12 | 13 |
| 2.25–3.00 | 8 | 9 | 10 |
| 1.25–2.00 | 5 | 6 | 7 |
| 0.50–1.00 | 2 | 3 | 4 |
| <0.50 | 1 | 1 | 1 |
-
WTR = with the rule astigmatism, ATR = against the rule astigmatism, OBL = oblique astigmatism.
