How can you tell if you scratched you cornea or if you simply have something stuck in your eye?

How can you tell if you scratched you cornea or if you simply have something stuck in your eye?
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answer:When scratched my corea while using my chain saw, the scratch was not visible. I went to the ophthalmologist who put a dye in my eye and then looled for the scratch under UV light. It showed up quite nicely. Even I could see it. I just covered it and had to wait a couple of days for it to heal over. How could something that small hurt so bad?
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