Refractive Index Explained
Higher index lenses are thinner. Common indexes: 1.50, 1.60, 1.67, 1.74. Pick by prescription strength and budget.
Budget Table
| Index | Best For | Price (RMB/pair) |
|---|---|---|
| 1.50 | Low prescription under ±2.00 | 100–200 |
| 1.60 | ±2.00 to ±4.00 | 200–400 |
| 1.67 | ±4.00 to ±8.00 | 300–600 |
| 1.74 | Above ±8.00, thinnest edge | 600–1200 |
Refractive Index Cheat Sheet
1.56 = common low-to-mid index (not recommended, Abbe ~36)
1.60 = mid index, good value
1.67 = high index, thin (Abbe ~32)
1.74 = ultra thin, premium