They’re just regular (prescription) glasses. The sky looks normal through them. What’s the deal?
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Most likely uv protective coating.
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.
blue light filtering
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This is because your friend is a wizard, and their personal objects pick up a magical blue-purple hue the more they are handled. This is a gradual process, so it’s not noticeable on most of their things, but they wear their glasses every day so they pick up the hue at a steady rate.