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Impact resistant & non-impact resistant over-glasses.
The Over Glass models featured above with polarized lenses are primarily designed to convert your spectacles into sunglasses. These polarized over glass models have a relatively thin lens material called TAC and they are not designed for use where impact protection is required eg. in the workplace or for shooting / target sports. As a general guide, if you need impact protection don’t use a polarized over-glass.
The non-polarised over glass models featured above use impact resistant, shatterproof polycarbonate.
It’s worth noting that normal prescription spectacles use a plastic lens material called CR39 – it is NOT shatterproof and provides limited impact protection. The non-polarized over glasses above with polycarbonate lenses convert your normal spectacles into safety eyewear providing impact protection for your eyes.