eyeglasses

I’ve made this joke many times, but nobody laughed.

It made sense to me. Glasses are lenses. Lenses need to be clean in order to perform their function. If you a photographer has dirty eyeglasses, how could you possibly trust them?
But I missed something important.

For one, glasses that are dirty are still better than no glasses at all. I should know. I am practically blind without optical correction. My glasses are filthy on occasion, but when they are, they are still better than uncorrected vision.

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