A chemical used in some over-the-counter eye drops may affect liver cells and be transformed to a PFAS-like substance. This is according to a new study. "We initiated the study last year to follow up on questions from a journalist about the safety of eye drops," says Tuulia Hyötyläinen. The Örebro researchers have studied a fluorinated compound, perfluorohexyloctane, which has properties and a structure that resembles PFAS. One difference is that it has previously been assumed to be biologically inactive. Meaning that it should not affect biological processes in the body. "Our study shows that this assumption may not always...