DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
MATERIAL
Six materials, and what each one survives.
Sport eyewear is chosen for weight, impact and corrosion, in that order. A material chosen for appearance alone is a material chosen for a photograph.
Illustrative material record
- Beta titanium
- Rimless mounts · light and springy, and it holds a thin section under load
- GRP polyamide
- Wrap frames · tough and light, and it moulds to a curve
- Polycarbonate lens
- Impact resistance · the standard for sport, and it is soft enough to scratch
- Trivex lens
- Impact and optical clarity · better dispersion than polycarbonate
- Rubber compound
- Nose and temple grips · stays grippy when wet, and it ages in sunlight
- Stainless A4
- Fixings · resists sweat and chlorides, where A2 does not
Illustrative examples for a fictional range. Material selection depends on the activity, the environment and the prescription, and is confirmed against a specification rather than a web page.
Why impact material is soft.
Because the property that resists impact is the same one that scratches. A hard lens is more scratch resistant and more likely to shatter, so sport lenses are soft and coated rather than hard throughout.
Why the fixing grade changes with sweat.
Because perspiration is corrosive. A stainless grade that is adequate in a dry climate corrodes at the temple fixing, which is the part touching the skin.