They’re just regular (prescription) glasses. The sky looks normal through them. What’s the deal?
Most likely uv protective coating.
Any coating might produce this through reflective destructive interference.
True but where I live in CA this would likely be the coating selected by the majority of people.
The anti-reflective (AR) coating can create blue or purple reflections from certain angles. The coating is meant to block some of the UV spectrum of light to help protect your peepers. It also prevents some of the reflections that would be annoying, hence the name.
Some coating on the glass is very faintly purple. Could be UV protection, anti glare, anti fog, etc.
Glass itself is very faintly green, so it’s not the color of the glass, unless they are made out of some other material (something like polycarbonate or sapphire).
Thank you, that is very interesting. They said they remembered being told at some point that there was a coating on the glasses.
It’s standard to have UV protection.
