New Study Tests Blue-Blocking Filter — On Just One Eye

A new study led by Mariana Figueiro of the Mount Sinai Light and Health Research Center explored a deceptively simple question: what happens if blue light is filtered from just one eye during night shifts?

Conducted over six nights, the trial found that short-wavelength filtering on one eye helped preserve melatonin levels without reducing alertness or task performance. Unlike earlier studies that fully occluded one eye, this approach maintained binocular vision and visual function.

It’s a small but intriguing result, particularly for lighting professionals designing environments for shift work.