A good pair of glasses not only needs the support of the frame, but more importantly, it needs a pair of good cheapest eyeglasses online lenses. Glasses are not consumables and do not require frequent updates, so choosing good eyeglass lenses is even more crucial.

High and stable visual requirements for vision, color, and distance should be achieved through the use of colorless and transparent lenses. If the car driver wears heavy-colored lenses and is not sensitive to distance changes, the distance judgment will be inaccurate.

After selecting the frame, the shape of the lens was chosen. Optical lenses with multi-layer anti-reflection films, colorless optical lenses, and nonspherical ultra-thin optical eyeglass lenses have better light transmittance.

The thickness of a lens is related to its refractive power, refractive index, frame size, and shape, pupillary distance and centroid displacement, astigmatism axis, and lens properties (concavity and convexity).

The weight of discount prescription glasses lenses is related to the lens material, and glass lenses are heavier than resin lenses. The same lens material, with a higher specific weight than a lower specific weight, and a higher specific volume than a lower specific weight (depending on the degree and size of the lens).

Resin lenses have higher strength and impact resistance than glass lenses, and are not easily broken. Glass lenses have higher hardness and are more wear-resistant than resin lenses.

The special functions of lenses, such as UV protection, electromagnetic radiation protection, infrared protection, high-temperature resistance, oil resistance, acid and alkali resistance, anti-dispersion, anti-deformation (ultra-thin non-spherical lenses), anti-strong light, and other functions. The lenses used for electric and gas welding, computer lenses, underwater lenses, and fishing lenses are different.

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