Using safety sunglasses

Working as a carpenter my husband is always running into different job situations. The concern with safety is always priority number one. He's always upgrading his safety equipment. We were cleaning out the shed to lighten our load by having a yard sale. I couldn't believe when I opened the box that there was over fifteen pairs of safety glasses. Darker ones, lighter ones, colored ones. To my amazement I slipped on one of the yellow pair. I don't know what they put on this lenses but my husband tells me the yellow ones worked terrifically in low light situations. everything looks extremely brighter and crystal clear.