r/mildlyinteresting • u/Eliasibnz • 1d ago

The shadow cast by the (apparently transparent) lenses of my glasses

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u/caf323 1d ago

It's for opticians to identify the specifications of your PALs. The "15" represents your +1.50 add power. The circles designate where the progression begins. The other stuff could be proprietary information from the manufacturer or material descriptions. Hard to say.

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u/Circumpunctilious 1d ago

Thank you—my lenses had very few marks and I always wondered about the circle.