Ireland's Jason Smyth is determined to secure a third consecutive Paralympic 100m gold at this month's Rio Games.

The Derry man won gold at the 2008 and 2012 Games in the 100m and 200m T13 categories but there will not be a 200m T13 race this time around.

"It's been four years since the last games. It's four years of training. You can't count how many hours you've put in," Smyth told RTÉ Sport.

"The effort for a 10-second race... you want to be there, you want to be on the podium and winning gold."

In addition to his vast collection of medals, the 29-year-old is also the second-fastest Irishman of all time, his 10.22 set in May 2011 only .04 seconds slower than Paul Hession's 2007 record.

He runs in the heats at 11.15pm on Thursday and will be expected to comforably make Friday's final.

"I've had a few injury issues, had surgery a year and a half ago, but bounced back really well.

"I won the World Championships last year, I ran 10.39 this year, which is the quickest I've run in a few years so I've started moving in the right direction."

Smyth, who is legally blind, competes in the T13 category for partially sighted athletes.

"I don't actually know what it's like to run with full vision so it's hard to say to what extent it impacts me or doesn't," he said.

"My eye-condition, Stargardt's, affects my central vision, which is generally the part of the eye that sees distance.

"So I often have to look past them to see things clearly."