The Good Transparency And Optical Uniformity Of Eyeglasses Lenses
The quality of the substrate determines the durability of the discount eyeglasses online lens and the reliability of the coating. A good substrate is clear and transparent, with a long usage time, and is not prone to yellowing; Some lenses turn yellow and even have peeling coatings after a short period of use.
Good lenses have no scratches, abrasions, rough surfaces, or pockmarks. When viewed diagonally towards the light, the smoothness is extremely high. There are no spots, stones, stripes, bubbles, or cracks inside the lens, and the light transmission is bright.
The grades of lenses produced in bulk are divided into different grades due to differences in intrinsic quality, and the prices of superior and inferior products vary greatly.
The higher the refractive index of a refractive index discount eyeglasses online lens, the thinner its thickness and the higher its price. Coating and UV-resistant resin sheets can undergo up to ten layers of coating treatment, including hardening (scratch resistance), anti-reflection, anti-static, dustproof, waterproof, etc. Different coating treatments have different effects.
If the coating process is reduced, the quality of the lenses will be greatly compromised. Similarly, wearing non-UV resistant lenses as UV resistant lenses can be very harmful to the eyes.
The brand differences in lenses lead to differences in quality and price. The quality of lenses is directly reflected in the brand of the lenses. Famous brand lenses have good and stable quality.
The transparency and optical uniformity of the discount eyeglasses online lens are good when holding the lens at a distance of about 30 centimeters from the eye and observing distant objects through the lens. If the object is clear and undistorted, and there is no jumping when slowly moving the lens, it indicates that the transparency and optical uniformity of the lens are good.
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