DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
FINISH
A coating on a sport lens is part of the safety.
A sport lens is soft by design, so the coating is what keeps it usable. It is specified for adhesion and for how it survives cleaning.
- Hard coat
- The base layer · what resists scratching on a soft material
- Anti-reflection
- Layered · reduces glare, and each layer is a place a coating can fail
- Hydrophobic
- The outer layer · sheds water and makes cleaning easier
- Mirror
- A reflective layer · reduces light reaching the eye, and scratches show
- Polarised
- A film inside the lens · cuts reflected glare, and it cannot be added later
- Untreated lens
- Bare material · cheapest, and it scratches within weeks
Illustrative finish reference
| Coating | Typical use | How it fails |
|---|---|---|
| Hard coat only | Budget sport lenses | Scratches, and the scratch scatters light |
| Plus anti-reflection | Prescription sport lenses | A layer lifts at the edge after edging |
| Plus hydrophobic | Water and sweat | Wears away first, and the lens smears |
| Mirror | Bright conditions | Scratches show as bright marks |
Why coatings fail at the edge.
Because the lens is cut to the frame after coating. Edging exposes an unbonded edge on every layer, and that edge is where water and cleaning get in.
The one worth avoiding.
A hydrophobic outer layer on a lens that will be cleaned dry. The layer is what makes cleaning easy, and a dry cloth wears it away in a season.