What needs to be clarified
Examine location and accessible damage depth, distinguish coating and substrate damage, and compare findings with construction, frame condition and documented handling of the spectacles.
Materials to prepare
- Both lenses retained in their original frame without further polishing
- Lens order identifying material and coating
- Photographs of line development and cleaning, storage and frame-repair information
What to compare
Under agreed lighting and magnification, record line direction, branches, edges and distribution on both sides. Compare lenses and mounting zones, noting mechanical contact marks. Investigate coating layers if needed. Heating damaged spectacles cannot reconstruct a past event; document lens removal after the initial inspection.
Possible outcome of the analysis
A damage map and opinion may locate changes within accessible layers, assess consistency with the mechanisms examined and identify information needed to distinguish remaining surface-change hypotheses.
Limits of the conclusions
A network alone proves neither overheating nor faulty coating application. Surface examination does not replace optical-parameter checks or determine medical suitability for an individual wearer.