Eyewear, Lenses & Vision Products calculator

Scratch Defect Cost Calculator

Scratch Defect Cost quantifies the financial exposure from scratch rejects found in surfacing, coating, edging, assembly, final inspection, or customer-return review. It supports quality and costing decisions for lenses, frames, or finished pairs.

What this calculator does

  • Estimate the cost impact of scratched lenses or finished pairs using defect count, replacement/rework cost, affected share, and fixed containment cost.
  • a quality engineer needs to estimate cost from scratched lenses in a production period
  • It estimates the total cost impact of scratch-related rejects, remakes, credits, or containment.

Formula used

  • Variable scratch defect cost = scratched lenses or pairs × cost per scratch defect × assigned defect cost share
  • Total scratch defect cost = variable scratch defect cost + fixed scratch containment cost

Inputs explained

  • Scratched lenses or pairs: Count lenses or finished pairs rejected, remade, or credited because of scratches in the chosen reporting period.
  • Cost per scratch defect: Use replacement lens cost, surfacing/coating labor, frame handling, remake labor, warranty credit, or scrap cost per defect.
  • Defect cost assigned to this scope: Use 100% for the full event or allocate a documented share to one lab cell, product family, supplier, or customer program.
  • Fixed scratch containment cost: Add sorting, inspection campaign, customer notification, expedited remake, freight, or corrective-action cost not captured per defect.

How to use the result

  • Use this for optical lab, eyewear manufacturing, prescription order, lens finishing, coating, tinting, inspection, packaging, costing, capacity, or purchasing planning when the inputs share the same product scope and time period.
  • Use the result as a planning estimate. Confirm prescription, fitting, lens design, coating, and inspection decisions against your lab standards, frame/lens supplier specifications, and applicable optical quality requirements.

Common questions

  • What is the Scratch Defect Cost calculator for? It estimates the total cost impact of scratch-related rejects, remakes, credits, or containment.
  • What information do I need before using it? You need defect count, cost per defect, assigned cost share, and fixed containment or corrective-action costs.
  • What does the result tell me? Use it to prioritize scratch reduction, compare supplier or process issues, set reserve costs, and decide whether additional inspection or handling controls are justified.
  • When is the result only an estimate? It is only an estimate when prescription order counts, lens counts, frame counts, coating times, tint times, edging or surfacing times, reject rates, remake costs, inspection rates, supplier costs, or lead-time assumptions come from plans instead of current lab records, validated time studies, ERP data, or supplier quotes.

Last reviewed 2026-05-12.