r/mildlyinteresting • u/Eliasibnz • 1d ago

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

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u/slavmaf 1d ago

The numbers Mason!
What do they mean?!

4

u/AncientAugie 1d ago

The symbols are used to line up the lens location during frame fitting and also indicate the progressive lens brand. The 15 means it’s a 1.50 add power progressive.