GreyOmega said:
Not really the same thing. Based on the appearance and definitions, browline glasses are full frame/rim glasses with a thick upper rim. Danbooru's Over-rim eyewear are semi-rim glasses with no rim/frame on the lower part of the lens. Googling "browline glasses" and you'll see in the images that the frame/rim goes all the way around the lens.
I do see your point here, but within the level of glasses detail many images have + subtlety of some designs it can be pretty difficult to differentiate. Maybe worth a tag of its own (maybe post #4119435 and/or post #5039174) but also very hard to distinguish with the difficulties of portraying edges of transparent lenses.
(On a related note, horn-rim eyewear does not necessarily describe over-rim eyewear despite its wiki)