While wearing these dark lenses, you have darkvision out to a range of 60 feet. If you already have darkvision, wearing the goggles increases its range by 60 feet.
Notes: Sense: Darkvision, Detection, Eyewear
120 feet of darkvision is op
Try devils sight, on a Tiefling, wearing these. 120 of perfect vision in dark, and then another 120 feet of Darkvision on top
I don't think those things stack. If I read it correctly, you would have darkvision to a range of 120 feet and devil's sight to the same range (making the original Darkvision and its buffed range effectively useless)
Drow w/ darkvision & these, you get 240 darkvision
Actually the goggles state: if you already have darkvision the goggles extend it by 60 ft. So you'd have 180ft of darkvision. Still opaf