This question on computer glasses reminded me that the next time I need to get a new pair of spectacles I've been thinking of getting photochromic lenses, which darken automatically in sunlight (UV specifically). Been getting sick of having to fiddle with clip-on sunglasses.
My only concern is that there may be some drawbacks for those of us that spend most of our toil staring at LCD screens.
Does anybody have any experience with these? Be it positive, negative or "makes no difference" it would be good to know.
Thanks.