The ANSI Z87.1 standard specifies safety requirements for eye and face protection to prevent injuries from hazards like impact, dust, chemicals, and radiation. 

Impact Resistance:

Lenses must pass tests for high-velocity and high-mass impact.

Eyewear marked Z87+ indicates high-impact protection, while Z87 indicates basic impact protection.

Lens Markings:

• Z87 or Z87+: Impact protection level.
• D3, D4, D5: Protection against splashes (D3), dust (D4), or fine dust (D5).
• U6-U0: UV protection, with U6 being the highest.
• R: Infrared protection.
• W1-W14: Welding protection.

Frame Markings:

Frames must be marked with Z87 or Z87+ and tested for durability, including flammability and corrosion.

Lens Types:

Clear, tinted, and special filters must meet requirements for optical clarity and protection specific to their use.

The Z87.1 standard ensures eyewear is durable, clear, and provides necessary protection for specific hazards in workplace or industrial environments.