Alva Review-Courier -

WASHINGTON (AP) — Is the pain stabbing or burning? On a scale from 1 to 10, is it a 6 or an 8?

Over and over, 17-year-old Sarah Taylor struggled to make doctors understand her sometimes debilitating levels of pain, first from joint-damaging childhood arthritis and then from fibromyalgia.

"It's really hard when people can't see how much pain you're in, because they have to take your word on it and sometimes, they don't quite believe you," she said.

Now scientists are peeking into Sarah's eyes to track how her pupils react when she's hurting and when she's not — part of a quest to develop the fi...