Green, blue or violet reflections describe how a coated lens looks under particular lighting and viewing conditions. They do not, on their own, establish coating quality, UV protection or blue-filter performance. For wholesale orders, approve the appearance under consistent conditions and specify measurable performance separately.
Key takeaways
- Residual reflection color and transmitted lens color are different observations.
- Use a retained reference sample with controlled viewing conditions.
- Confirm each performance claim with appropriate product evidence.
What is residual reflection?
Anti-reflective coatings reduce reflections but do not make every reflection disappear. ZEISS discusses residual reflection as part of the coating system. A visible color therefore should be interpreted in the context of the specified coating, lighting and angle.
A photograph can exaggerate or shift that appearance through exposure, white balance and surrounding colors. Do not approve a repeat-order color match using two phone photos taken in different environments.
Reference: ZEISS: Spectacle lens coatings
Separate three different questions
Keep the following observations in different columns on the approval sheet. This prevents a familiar surface color from being used as evidence for a different property.
| Question | Useful evidence | Insufficient shortcut |
|---|---|---|
| Does the reflection appearance match? | Reference sample under agreed lighting and angles | Uncontrolled supplier photograph |
| Is the transmitted appearance acceptable? | Side-by-side viewing through the lens under a defined setup | Looking only at reflected light |
| Does the claimed filter performance apply? | Product-specific transmission data and criteria | Calling every blue reflection a blue-cut lens |
Write a practical visual approval procedure
Set aside a retained master sample with its coating identifier and approval date. Define the light source, background and viewing positions used for the visual comparison. Inspect both sides where the product specification requires it and distinguish pair matching from a match to the master.
For an illustrative disagreement, a buyer sees a stronger violet reflection in warehouse lighting than in a supplier's photograph. Recheck both samples under the agreed conditions before treating the observation as a batch failure. If appearance remains outside the approved range, record the difference and request a technical review.
- Use the same background and light source.
- Compare actual lenses at consistent angles.
- Record coating revision and batch identity.
- Agree how borderline visual differences will be resolved.
Approve marketing wording separately
A name such as green HMC may communicate a commercial appearance option, but it should point to a defined product specification. If the supplier proposes another coating system with a similar look, review its performance and processing compatibility before allowing substitution.
Use images to help buyers understand the appearance choices and invite sample confirmation. Avoid statements that a particular reflection color is universally superior. The correct comparison depends on the properties and intended use that the buyer has actually specified.
Buyer questions
Frequently asked questions
Is green AR coating better than blue AR coating?
Color alone does not establish overall quality. Compare the specified optical, durability and appearance requirements for the exact coatings.
Does a blue reflection mean the lens blocks blue light?
It does not establish the claimed transmission performance. Request the relevant spectral evidence.
Can reflection color change with viewing angle?
Appearance depends on viewing conditions. Use consistent angles and lighting for sample and batch comparisons.
Further reading
These external references provide background context. Product availability and performance claims must still be confirmed for the exact item being purchased.