Good discount prescription glasses lenses have a purer and more transparent base color, while poor lenses may slightly yellow and have lower transparency. Of course, good lenses cannot be made into a qualified pair of glasses without excellent processing.

Many people are confused when choosing lenses now. There are various price ranges for discount prescription glasses lenses. How to quickly distinguish between good and poor lenses? Look at the film layer.

The shape, appearance, and basic chemical materials of the lenses are all very easy to imitate, which means that the appearance that DSLR customers can see with the naked eye can be replicated.

We can hardly see the differences in other optical qualities, degree accuracy, curved surface design, inner surface design, double non spherical surface design, etc. with the naked eye. These all need to be measured with the help of some professional equipment.

Good eyeglass online lenses have excellent film layers. The quality of the film layer is like a magic mirror for good or bad lenses, and film layer technology is also the core technology and responsibility.

Resin lenses have lower hardness and are prone to scratches on their surface. In order to improve the wear resistance of the lens, it is necessary to coat a hard film on the surface of the lens.

At present, silicon atoms are commonly used for hardening treatment, that is, a hardening solution containing organic matrix and inorganic ultrafine particles including silicon element is used to give the hard film both toughness and hardness.

The most important modern coating technology is to use immersion method. The coating of the hard film is relatively thick, and for resin lenses coated with hard film, it can be identified by the sound of desktop tapping and the color brightness of the lens. The lenses with crisp sound and bright edges have undergone hardening treatment.