The "three packs" defines the product category of the glasses included in the "three packs" of glasses: spectacle frames, lenses, lenses (including old glasses, sunglasses, etc.) and contact lenses. When new rules for different glasses accessories leasing period and synthetic range of detailed rules (see chart), for example, in to buy glasses, within 14 days of spectacle lens appear due to the unreasonable lens edge Angle, processing and assembling the lens of the crack due to tight, or due to the thickness of the lens center or edge thickness is too thin, on the edge of collapse, businesses should be replaced; Within half a year, however, businesses will have to ensure that the anti-film lenses they sell do not defilm, or they will have to be replaced free of charge. "3 packets" regulation emphasizes, the businessman is in sell above of glasses while, in the period that stipulates use inside all must implement "3 packets" regulation.