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E-SPF is inspired by the protection index used to rate skincare and sunscreen products efficiency against ultraviolet rate: H igher values of E-SPF indicate greater level of spectacles UV protection.
With E-SPF = 25, your eyes are 25 times better protected than without any protection.
(E-SPF excludes direct eye exposure from around the lenses).
This rating system is eligible for clear and photochromic eyeglasses as well as for sunglasses, with values ranked from 2 to 25 for clear lenses, and up to 50+ for sun lenses.
Today, Crizal Forte ® UV provide the best UV protection for an Essilor clear lens, with an E-SPF of 25.
For corrective sun lenses, Crizal Sun UV guarantees an E-SPF of 50+