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 are offered vision benefits, according to the Bureau of Labor Statistics.

If you’re on Medicaid, whether you can receive vision care depends on the state you live in. Patients on the traditional Medicare progr

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