In Canada, prescription safety glasses must meet the CSA Z94.3 standard, the primary benchmark for eye and face protection, ensuring they pass rigorous tests for impact, durability, and optical clarity, with certification marks like CSA or ANSI Z87.1 visible on frames and lenses. Key quality aspects include durable frame materials (polycarbonate often used), impact-resistant lenses (not glass), adequate side protection, and ensuring the eyewear can handle specific workplace hazards like chemicals or radiation, with requirements varying by environment.