Light-Responsive Glasses, Transition Lenses Review 2021 Leave a comment

According to lens company Vision Ease, the first photochromic lens was developed in 1966 when silver halide crystals were embedded into a molten glass substrate, “[causing] the finished lenses to darken in reaction to UV in just a few minutes, and would achieve maximum darkness after about 15 minutes,” their research reported, “[but these] early photochromic lenses did not always perform ideally. If the prescription called for one lens to be thicker than the other, the thicker lens would darken more quickly and become darker than the thinner lens. The photochromic performance could be short-lived, and the lenses often appeared slightly dark indoors.” These days, however, transition lenses in their resting, indoor state look virtually clear (as you can see from my before-and-afters below).

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