Vision Prescription Guide
Myopia (Nearsightedness) — SPH Diopters
| Diopters | Severity | Without Glasses |
|---|---|---|
| 0 to -0.75 | Borderline / Mild | 20/25 – 20/40 |
| -1.00 to -3.00 | Low Myopia | 20/50 – 20/200 |
| -3.25 to -6.00 | Moderate Myopia | 20/200 – 20/400 |
| -6.25 to -10.00 | High Myopia | 20/400 – count fingers |
| > -10.00 | Severe Myopia | Very limited |
Understanding Prescription Abbreviations
| Abbreviation | Meaning |
|---|---|
| SPH / S | Sphere — degree of myopia (-) or hyperopia (+) |
| CYL / C | Cylinder — degree of astigmatism (always - or +) |
| AXIS | Direction of astigmatism (1°–180°) |
| ADD | Reading addition for presbyopia (bifocal/progressive) |
| PD | Pupillary distance in mm |
| OD / RE | Right eye (Oculus Dexter) |
| OS / LE | Left eye (Oculus Sinister) |