Strengthening film: also called adding hard film, is a layer and Square Prescription Glasses lens similar refractive index of metal oxide and coupling agent mixed film layer. It has high hardness, high adhesion, high light transmission and other characteristics, can effectively improve the wear resistance of the Square Clear Glasses lens, not easy to defilm and yellow, greatly improve the service life of the lens. Antireflection film: also known as antireflection film, it uses the interference principle of light, so that the light reflected back through the film on both sides of the interference, so as to cancel each other, reduce or eliminate the Pink Tortoise Eyeglasses lens light reflection, so as to improve the lens transmittance. In general, it is difficult to achieve the ideal antireflective effect by using a single layer antireflective film, because a layer of antireflective film only has an antireflective effect on a certain band of light, often double, three or even more layers of antireflective film are used to improve the antireflective effect of visible light in the whole band, so as to make the Tortoise Round Glasses lens more transparent.
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