If it's after hours, the on-call physician may suggest you go to the emergency room for an evaluation and removal, especially if you've tried to remove the contact several times or are experiencing eye pain or redness.

CNN: How can I safely remove a stuck contact lens?

Sometimes eye symptoms may appear before others, like joint pain, in patients.

WSJ: What Your Eyes Reveal About Your Health

It's derived from dimethyl sulfoxide (DMSO), which was promoted as a pain reliever in the 1960s and 1970s until scientists discovered in animal tests that it caused eye damage in high doses.

FORBES: Blue Streak