Do Sunglasses on Brazilian Market Have Blue-Light Protection?

In recent years there has been growing interest among the public and scientists in blue-light protection. We analyzed blue-light protection in sunglasses available on Brazilian market, separating them according to their categories. We measured lens transmittance using a VARIAN Cary 5000 spectrophotometer, and we calculated luminous and blue-light transmittance. A sunglasses lens is considered to be minimally safe against blue light if its blue-light transmittance is less than 1.2 times its luminous transmittance. From 222 unbranded lenses, 4.5% of them fail our test of blue-light protection and 2.7% of them are excessively dark. This study is part of a series that intend to investigate optical characteristics of sunglasses on Brazilian market in order to evaluate whether they provide enough safety and protection against harmful solar radiation to the public. We believe that our analyzes may improve knowledge about the quality of sunglasses available on Brazilian market.