Cardinals rookie quarterback Phillip Sims didn't impress the team in OTAs, but he's still in the running for the team's third-string job. 

It turned out he had a reason for the struggles. Tests showed that he had 20/50 vision in one eye and 20/100 vision in the other. 

“The doctor actually said, ‘It’s amazing that you’re here, with your eyesight that bad and playing quarterback on top of it,’ ” Sims said, per AZCardinals.com.

Sims is being fitted with corrective lenses which will help ... they think. 

“The doctor was like, ‘Two things can happen: You can do the corrective lenses and it can make you that much better, or it can freak you out because you’re not used to seeing so much stuff,’ ” Sims said. “They want to test me out to see how I respond to it.”