Lenses made of NXT polyurethane have great advantages in impact resistance, fluidity, light weight and visual quality, but they are expensive.buy prescription sunglasses online，

The windows are heavier and expensive, and may "crack" after being dropped.

Polycarbonate's damage resistance and optical transparency are generally not as good as NXT polyurethane or glass, but it is cheaper.

Polyamide is actually a seldom used substance, it may provide eye quality similar to windows, but without the threat of damage.

The scratch resistance of different polycarbonate contact lenses varies greatly, depending on the hard-to-define cover work surface used in production.

Acrylic products have a lower cost, but their life span and optical clarity are the worst. They also have poor heat resistance and often deform. The cup or resin supply is the most effective decision.

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