What indicates that ANSI Approved Industrial Safety Glasses have safety lenses?

The indication that ANSI Approved Industrial Safety Glasses have safety lenses is that they are marked with the manufacturer's monogram. This marking is part of the American National Standards Institute (ANSI) standards, which ensure that the safety glasses meet specific criteria for impact resistance and optical quality. These standards are crucial in determining whether the glasses provide adequate protection for industrial and safety environments. When you see the manufacturer's monogram, it serves as a certification that the lenses have been tested and meet the regulatory safety requirements, ensuring they can withstand high-velocity impacts and provide the necessary eye protection.

Other characteristics, such as lenses being colored, the frame color, or warranty details, do not inherently signify that the lenses meet safety standards or provide the necessary protection for industrial use, which is why they are not valid indicators.