Abstract
Ocular UV doses accumulate all-day, not only during periods of direct sun exposure. The UV protection efficiency of three clear lenses was evaluated experimentally, validated by simulation, and compared to non-UV protection: a first spectacle lens with a tailored UV absorber, a second spectacle lens, minimizing UV back reflections, as well as a third spectacle lens, combining both. A tailored UV-absorber efficiently reduced overall UV irradiance to 7 %, whereas reduction of back-reflections still left UV irradiance at 42 %. Thus, clear lenses with a tailored UV absorber efficiently protect the eye from UV, supplementing sun glasses wear to an all-day protection scenario.
Highlights
Extended ocular UV exposure is well known to impact long-term ocular health
Optimal UV protection will be reached if clear lenses efficiently minimize UV exposure as well
UV absorbers are a common additive in organic spectacle lens material, increasing material durability
Summary
Extended ocular UV exposure is well known to impact long-term ocular health (for review, see [1]). Sun glasses constitute the current standard protection of the eye against UV [4]. Australian sun glass standards are the common UV protection bench mark, those define light in the range of 315 up to 400 nm as harmful UVA [5, 6]. Wearing of sun glasses is socially acceptable outdoors during sunny weather, its usage is not commonly accepted under all potential UV exposure conditions, such as during cloudy weather conditions as well as indoors [7]. Practical reasons limit the use of (corrective) sun glasses to rather long-term UV exposure situations, as frequent exchange with corrective clear spectacles is cumbersome, storage of an extra pair of spectacles becomes necessary. Harming UV exposure is not limited to extended outdoor stays in sunny weather. Optimal UV protection will be reached if clear lenses efficiently minimize UV exposure as well
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