Safety should always be a top priority when you’re working, but every day, an estimated 2000 eye injuries occur in American workplaces, according to Prevent Blindness America. These injuries could have been prevented with the proper safety eyewear. Several types of lenses are available for safety glasses, and choosing the best material for the job is vital in providing the best protection. Glass has the best optics Glass lenses used to be the standard, but demand for this expensive material is decreasing. It is best known for its superior optical quality, which makes it a good choice for prescription safety glasses. Glass is durable and scratch resistant, but it’s heavy and more expensive than other lenses. When tempered in a chemical bath, glass can meet impact-resistance standards; yet some industry experts still don’t recommend it for most job sites because better lenses are available. However, glass is often preferred for those working on projects where static electricity is a concern. Plastic is inexpensive Plastic lenses are lighter and more comfortable than glass, but they need to be thick to meet industry impactresistance standards. Although plastic lenses scratch, they…
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Polycarbonate IS a plastic, so I don't know what you mean when you say "plastic lenses." Maybe acrylic? For a comparison, see http://www.hydrosight.com/acrylic-vs-polycarbonate-a-quantitative-and-qualitative-comparison/