Quick Answer
Yes — 1.56 standard lenses accept -3.25. They will be functional but slightly thicker and heavier than mid/high-index options.
Recommendation
| Index | At -3.25 |
|---|---|
| 1.56 Standard | Works; thicker profile |
| 1.61 Mid-Index | Thinner — recommended |
| 1.67 High-Index | Slimmest for this range |
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