How to read the inscription
In an inscription such as RB2289 ··· 60□·· 135, each part has a purpose:
This reference comes in 2 sizes. Find the number right before the □ symbol on your arm and choose that same lens size:
- 60□ → 60 mm
- 63□ → 63 mm
The number after the □ is the bridge: it isn't used to choose the lens. Can't read it? Measure your lens from side to side at its widest point; that measurement in millimeters matches the lens size.

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