A reader asks:

 For use with a light box (with or without UV shielding), is it better to buy UV glasses to block possible UV rays entering the eye?


It is unnecessary to add UV glasses when using a light box that has filtered out UV at the 99%+ level. Tinted UV glasses will actually reduce the level of therapeutic light you receive. That said, however, some light box manufacturers claim to filter out UV when in fact their devices fall short of the 99%+ level. In such cases, clear UV glasses would protect the eyes, but not the skin. In our experience, the only screens that do the job perfectly use polycarbonate or OP-3 diffusers. Check manufacturers’ specs!