How to select the tint's densities of lenses?

[prescription eyeglasses]

The high 85% tint densities could offer greater protection for the harmful ultra-violet (UV) rays. Normally, the tint of lenses has three tint densities which are 25%, 55%, and 85%. And 25% tint density is for aesthetics and 85% is the largest amount for protection against UV rays.

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