Whether in sun or in shade, in summer or winter, you should protect your eyes from harmful UV rays. Polycarbonate lenses, which safety glasses are usually made out of, absorb almost 100% UV rays. Glasses that wrap around and have good coverage of your eyes will be your best protection.
For assistance with personal protective equipment and protecting employees from hazards, or other safety issues, please contact CHESS, Inc at carkey{at}chess-safety.com.