Sure, workers may want to wear sunglasses for comfort, but they may need them for protection.
The eyes are susceptible to being burned by the sun(1). The cornea, lens and retina are all vulnerable to overexposure to ultraviolet (UV) rays. Over time these UV rays — invisible to the human eye — can harm the eye if left unprotected. So workers who are heavily exposed to sunlight should protect their eyes with UV-blocking sunglasses.