Test lens transparency and optical uniformity

 Hold the Rimless Eyeglasses lens 30 cm in front of the eye and observe the distant scenery through the lens. If the scenery is clear and without deformation, and there is no scene jumping when the lens is moved slowly, the transparency and optical uniformity of the lens are good. The firmness of the film can be tested by referring to the technical requirements of the optical Cheap Reading Glasses lens surface coating in the "National military standard". The simple way is to use tape (yellow plastic tape common in the market) to stick to the Buy Reading Glasses lens surface, so that the tape and the lens surface is 90°, and tear off the tape forcibly. If the film layer falls off, the coating quality is not good. The Reading Glasses For Sale lens at the same position of continuous tape tear test 20 times, the coating did not fall off, can be considered as the coating firmness qualified.