DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
REVISION
A revision to a curve reaches every prescription.
Changing a base curve or a lens thickness changes what can be made in the frame. A revision that looks mechanical is a revision to what the product can accept.
- Revision letter
- Every change, however small, gets one
- What changed
- The feature, the value and the reason
- Prescription impact
- Whether the range of powers the frame accepts has moved
- Lens impact
- Whether existing lens stock or a cut lens has to be remade
- When it took effect
- Which batch was the first made to the new revision
- What it supersedes
- Which revision the new one replaces
| Rev | Change | Reason | Prescription impact |
|---|---|---|---|
| A | Base curve raised 8 to 9 | Frame moved at speed | Maximum power reduced |
| B | Temple pressure raised | Frame slipped when wet | None |
| C | Lens thickness reduced 0.2 mm | Weight complaint | Impact standard re-tested |
Why the prescription column belongs on the log.
Because a curve change silently removes powers the frame used to accept. A dispenser working from an old chart orders a lens that cannot be cut, and the error surfaces at the edging bench rather than at the order.
The habit worth copying.
Recording which batch was the first made to the new revision. Without it, a frame sits between two revisions and nobody can say which curve it was built to.