Eyeglass testing equipment turns out to test these!
Eyewear testing includes eyeglasses lens testing as well as glasses frame testing. These tests are typically done before glasses leave the factory: frame deformation; dimensional stability at high temperatures; resistance to perspiration; bridge deformation; frame endurance test; ignition test; frame measurements and dimensional tolerances; check markings; lens retention; instructions and warnings on packaging; and nickel testing (metals only).
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