DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
INSPECTION
A frame is inspected for symmetry, not for size.
A frame that is a millimetre out is invisible on a shelf and obvious on a face, because the face notices asymmetry that the eye does not.
Illustrative inspection checklist
- Symmetry
- The two rims match in width, height and angle
- Hinge alignment
- Temples fold to the same angle and meet the front squarely
- Surface
- No polish marks, sink marks or scratches on the front
- Bridge
- Formed to the drawing and free of sharp edges
- Temple length
- Measured, because it is the dimension that is adjusted least
- Plating
- Present and even, and undamaged at the hinge
- Lens seating
- Sits in the rim without stress, which shows as a distortion
- Marking
- Batch identifier legible on the temple or its packaging
An illustrative checklist for a fictional range. A real programme defines the tolerance, the sampling method, the inspection window and the remedy if a batch fails.
The four things a programme needs in writing.
The tolerance, the sampling method, the window in which inspection happens, and what happens if the batch fails. Without all four, a failed delivery becomes an argument rather than a process.
Why symmetry is checked rather than size.
Because size varies with the fit and the wearer, while asymmetry is a defect. A frame that is slightly small is a frame that does not suit; a frame that is twisted is a frame that was made wrongly.