CHICAGO (WLS) -- On Sunday, tens of thousands of runners will take to the streets for the Bank of America Chicago Marathon.

Running more than 26 miles is not an easy take. Running it while you're blind is a whole new challenge.

ABC7 Chicago is now streaming 24/7. Click here to watch

On Friday, 67-year-old Tim Paul walked with help down State Street in the Loop, but on Sunday, he will be running there as part of the Bank of America Chicago Marathon course.

Paul lost his sight in his 20s, making his goal of running a marathon quite a bit a bit more challenging, but not impossible. Sunday will be his 24th marathon.

"I also don't want people to see me as only blind. I want them to see me as a marathon runner," Paul said.

He trains while tethered to a guide runner, who helps him navigate

See Full Page