![Any idea what these weird numbers and letters on prescription sunglasses lenses. Just bought these prescription sunglasses and they have these 2 alphanumeric on each of the lenses (circled). Are these normal, Any idea what these weird numbers and letters on prescription sunglasses lenses. Just bought these prescription sunglasses and they have these 2 alphanumeric on each of the lenses (circled). Are these normal,](https://i.redd.it/axfs9he3p2c51.jpg)
Any idea what these weird numbers and letters on prescription sunglasses lenses. Just bought these prescription sunglasses and they have these 2 alphanumeric on each of the lenses (circled). Are these normal,
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