The Bureau of Labor Statistics (BLS) reported that more than 50% of workers injured
while wearing eye protection thought the eyewear had minimized their injuries.  But
nearly half the workers also felt that another type of protection could have better
prevented or reduced the injuries they suffered.

It is estimated that 90% of eye injuries can be prevented through the use of proper
protective eyewear.  By working together, OSHA, employers, workers, and health
organizations can make it happen.  ( 1 )

Lens Options

"Blocks Ultraviolet Rays"

You should always buy safety glasses with this feature.  Long-term exposure to ultraviolet (UV) radiation in sunlight is linked to eye disease.  Both plastic and glass lenses absorb some UV light, but UV absorption can be improved by adding chemicals to the lens material during manufacturing or by applying special lens coatings.  Shop for safety glasses that block 99 or 100% of all UV light.  Some manufacturers' labels say "UV absorption up to 400nm."  This is the same thing as 100% UV absorption.

"Polarized"

Polarized lenses cut reflected glare of light, including sunlight, that bounces off smooth surfaces like pavement or water.  They can be particularly useful for driving and fishing.
Polarization has nothing to do with UV light absorption, but many polarized lenses are
now combined with a UV-blocking substance.  Check the label to make sure the lenses
provide maximum UV protection.

"Mirror-coated"

Mirror finishes are thin layers of various metallic coatings on an ordinary lens.  Although they do reduce the amount of visible light entering your eyes, do not assume they will fully protect you against UV radiation.

"Wraparound"

Wraparound glasses are shaped to keep light from shining around the frames and into
your eyes.  Studies have shown that enough UV rays enter around ordinary eyeglass frames to reduce the benefits of protective lenses.  Large-framed wraparound sunglasses can protect your eyes from all angles.

"Impact resistant"

All safety glasses must meet impact standards set by the Occupational Safety and Health Administration (OSHA) and the American National Standards Institute (ANSI).  No lens is truly unbreakable, but plastic lenses are less likely than glass lenses to shatter when hit by a ball or stone.  Polycarbonate plastic, used in many sports sunglasses, is especially tough but may scratch easily.   Scratched lenses should be replaced immediately.

Lens darkness

A medium lens is good for day-to-day wear, but if you use the glasses for very bright
conditions, choose a darker lens. The color and the degree of darkness do not tell you
anything about the lenses' ability to block UV light or the quality of protection offered.