They can and do. That’s what the optometrist is checking when they flip the little lenses around and rotate them and it’s obvious it wasn’t to change the focus. It doesn’t get more/less clear unless you have astigmatism when they’re flipping those ones (at least in the same way).
Maybe astigmatism can have different orientations, it’s a wrongly shaped lense, after all. And there are many false shapes for that.
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They can and do. That’s what the optometrist is checking when they flip the little lenses around and rotate them and it’s obvious it wasn’t to change the focus. It doesn’t get more/less clear unless you have astigmatism when they’re flipping those ones (at least in the same way).