Interesting finding. A tangent: even if this study is correct, there still may be value in certain nonprescription lenses for long computer use.

I have glasses my optometrist suggested for long computer use, and they do block blue light, but she seemed more concerned with focal distance. She says that our eyes more naturally focus on things further away, but that lenses can adjust the focal point to be closer in, reducing eye strain.

I have adjusted to them, and now prefer using them. When I don't have them, it feels like things take more energy/focus to read on the screen, and if I leave my desk without taking them off, it feels like it's harder to focus on things at longer distances. I'm already nearsighted and wearing them in addition to contacts.