UV protection?

[owman]

Is there a link to chart showing all lens materials showing untreated lenses uv protection? When I google I see self proclaimed experts saying what I know to be BS.

[PRECISIONLAB]

I'm curious as well..

[Uncle Fester]

A heritic responds:

From an unimpeachable source:

In optical standards, UVB is defined as radiation ranging from 280 to 315 nm and UVA is defined as radiation ranging from 315 to 380 nm.

Polycarbonate absorbs 100% of UVB and 100% of UVA.

Most high-index plastics also absorb 100% of UVB and 99-100% of UVA.

Untreated hard resin (CR-39) absorbs 100% of UVB and 80-92% of UVA, depending upon the manufacturer.

And, as Chris has already pointed out, you can treat hard resin with a UV solution to provide greater absorption of UVA or blue light up to 400 nm.

Care should be taken when treating lenses that will have an AR coating applied, however, since excess UV solution can reduce adhesion in some cases.

Note that in Europe, they measure "Solar UV," which is slightly different than the figures used in the US.

Best regards,
Darryl

https://www.optiboard.com/forums/showthread.php/49005-Poly-and-UVA-and-B?highlight=absorbtion+glass