Eyewear, Lenses & Vision Products worked example
Scratch Defect Cost at 110% defect cost assigned to this scope: a worked example
Push defect cost assigned to this scope up to 110% and the picture changes. This example computes every intermediate figure at that operating point. a quality engineer needs to estimate cost from scratched lenses in a production period
The inputs for this scenario
- Scratched lenses or pairs: 38 defects (unchanged)
- Cost per scratch defect: 42 $ / defect (unchanged)
- Defect cost assigned to this scope: 110 % (raised for this scenario; the documented default is 100)
- Fixed scratch containment cost: 350 $ (unchanged)
Working through the calculation
- Applying the documented formula (Variable scratch defect cost = scratched lenses or pairs × cost per scratch defect × assigned defect cost share) to the inputs above produces each figure below.
- At this operating point the engine returns 2,106 $ for total scratch defect cost, the number this scenario is built around.
- At this operating point the engine returns 55.41 $ / defect for average cost per scratched lens or pair.
- At this operating point the engine returns 1,756 $ for variable scratch defect cost.
- At this operating point the engine returns 350 $ for fixed scratch containment cost.
How this compares with the baseline
- Against the tool's baseline example, where defect cost assigned to this scope sits at 100% and the headline result is 1,946 $, this scenario comes in 8.2% above the baseline at 2,106 $.
- It computes total scratch defect cost by combining per-defect variable loss (scaled by the assigned share) with a fixed containment cost. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.
Results at a glance
- Total scratch defect cost: 2,106 $ (headline result)
- Average cost per scratched lens or pair: 55.41 $ / defect
- Variable scratch defect cost: 1,756 $
- Fixed scratch containment cost: 350 $
Run it with your numbers
- Every input above is editable in the live Scratch Defect Cost calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.