The eyes aren’t just a window into the soul — they can also tell doctors a lot about what’s happening in the rest of our body. Why, then, do I have separate insurance cards for my medical and vision care? It’s another oddity of US health care, a system that nobody would necessarily design on purpose but one we’re nevertheless stuck with. During open enrollment this year, you might be able to sign up for a vision plan through your work for, say, $10 per month or so — if you’re lucky. But for many Americans, vision insurance simply isn’t an option: Less than 30 percent of US workers a...

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