Table 1 Nomogramproposed by Thorton for performing R.K. in a patient with exclusive myopic component
From: Radial keratotomy: background and how to manage these patients nowadays
PROPOSAL TO CHANGE MYOPIC POWER | OPTICAL ZONE (NUMBER OF INCIÕES REQUIRED IN PARENTHESES) |
|---|---|
0.75—1.12 | 5.00 (8) 4.75 (4) |
1.13—1.49 | 4.75 (8) 4.50 (4) |
2.12—2.61 | 4.25 (8) 4.00 (4) |
2.62—3.11 | 4.00 (8) 3.75 (4) |
3.12—3.73 | 3.75 (8) 3.50 (4) |
3.75—4.36 | 3.50 (8) 3.25 (4) |
4.37—5.11 | 3.25 (8) 3.00 (4) |
5.12—6.11 | 3.00 (8) |
6.12—7.50 | 3.00 (8 and reset to 98% 5 mm optical zone) |
7.51—8.00 (OR MORE) | 3.00 (8 and reset to 98% 5 and 7 mm optical zone) |