Article
Tinted lenses
Three main reason for tinting:
1.protection from harmful rays (UV/IR)
2.comfort where there is glare
3.cosmetic
Ultra violet (UV) radiation
this rays with wavelength under 380nm
315-380nm,possibly the most dangerous
280-315nm,reponsible for sunburn and snow blindness
below 280nm,effectively filtered by ozone layer,less absorption at high altitudes and nearer the equator
infra red(IR) radiation
this is a hot harmful,more than 750nm radiation which is found near the equator and in "glass" industry.
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