If it weren't for polymers, some folks, like me for example, wouldn't be able to see! In the old days, eyeglasses were made of glass. (duh!) But for some people with really bad eyesight, like me for example, glass lenses would just be way too thick and heavy. Also when you're a destructive child with bad eyesight, like I was, glass doesn't stay unbroken for very long. So nowadays eyeglasses are often made of a special kind of polycarbonate that's a lot lighter than glass. Also it has a higher refractive index, so really strong lenses don't have to be nearly so thick, which is great for us folk who can't see very well. Lenses can also be made of PMMA, or poly(methyl methacrylate).
There are also polymers in contact lenses. A long time ago people wore hard contact lenses that were made of PMMA, or poly(methyl methacrylate). But these were uncomfortable, so much so that many folks just preferred to wear glasses. Thankfully, along came much more comfortable soft contact lenses, made from polyacrylamides.
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