Visible light transmittance ★ should be no less than 85% Visible light haze ★ should be no more than 2% Temperature resistance should be free of obvious discoloration, bubbling, deformation, rupture, etc. Drop performance should be free from high places, and there should be no obvious damage that affects use Phenomenon fog drop protection performance If no color spots appear on the test paper within the center of the lens, the lens is considered qualified. Diopter ★ The mutual difference in diopter is +0.05~-0.07D The elastic modulus of the frame material is 1.5-15MPa The elongation at break of the frame material is ≥200 % Anti-fog performance The inside of the goggles should not fog up within 10 hours, and the identification symbols on the face of the headform can be clearly seen.