Why did I get additional plano lenses?

I ordered glasses from Mister Spex.

The glasses arrived with the expected correction, and also an additional pair of plano lenses. I’m not sure why they do this.

For info, the corrections are still way beyond the point where wearing a plano lens could be useful in any way for me (talking about multiple diopters of correction here).

Any reason why they include this? I’ve never seen this before.

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Ask them. As for plano lenses, avoid them, as they still distort vision. If you want no correction in one eye, just take out the lens, as I do.

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