nocry safety glasses that fit over your prescription eyewear. clear anti-scratch wraparound lenses, uv400 protection, ansi z87 & osha certified. use in the lab, travelling, black & orange frames nocry <b>technical specs</b> <ul> <li><b>material:</b> latex free polycarbonate</li> <li><b>lenses:</b> clear, with scratch resistant coating</li> <li><b>uv protection:</b> 400nm (nanometers)</li> <li><b>ppe field of view:</b> >40°</li> <li><b>max temple arm length:</b> 5”</li> <li><b>max nose bridge diameter:</b> 1”</li> <li><b>total frame width across the front:</b> 5.7”</li> <li><b>max frame height:</b> 1.77” in the center</li> <li><b>weight:</b> 0.083lbs</li> </ul> <br> <b>since these glasses are clear, how do they keep your eyes safe from uv light?</b><br> the 400nm uv protective lens coating is the highest industry standard in clear ppe eyewear lenses. shield your eyes from not only 90-100% of harmful uva and uvb radiation rays, but also uv light emitted by artificial light sources. safeguard this coating by cleaning the lenses with a microfiber cloth, and store in the nocry protective case (sold separately). avoid using rough cloths or household glass cleaner.<br><br> <b>how to reduce the chances of scratching your prescription glasses?</b><br> ensure no part of your eyewear lenses are in direct contact with the otg glasses. there should be a gap between the lenses of your own glasses and the lenses of the otg glasses. if you have thin frames, fully extend the adjustable arms of the over-spec glasses. the tops of the frames of the otg’s should be directly on top of and over the frames of your glasses - both pairs should feel secure and snug.<br><br> <b>are they comfortable enough to wear all day?</b><br> according to hundreds of customer reviews, these safety glasses are so comfortable you'll forget you're even wearing them. the unobstructive lightweight construction and the soft rubber nose piece mean they sit lightly on your face. they won't feel bulky or awkward even after hours and hours of work.