(CNN) -- "I was awake but paralyzed," says Carol Weihrer as she recalls undergoing eye surgery in 1998.
"I could hear the surgeon telling his trainee to 'cut deeper into the eye,'" she says. "I was screaming, but no one could hear me. I felt no pain, just a tugging sensation. I tried to move my toes or even push myself off the operating table, but I couldn't move. I thought I was dying."