Sundip, aged 37 from London, who has an eye condition closely related to Stargardt Disease, got into running in 2012. Since starting jogging, he's completed a number of marathons and even some ultramarathons.
“I used to be quite unhealthy and didn’t do any exercise. Then in 2012, I started jogging to get a bit healthier and signed up for a marathon with my wife. I’ve run races almost every year since.
“I try to run at least 1,000km a year, but some years I’ve done 2,000. I go after 50-mile races and double marathons. I just like the idea of doing a huge distance. I've run six ultramarathons and in 2016 I ran four. I also love trail running, through woods and over steep hills."
"My blood pressure, heart rate and aerobic endurance have improved so much since I started running. But most of all, my frame of mind has improved.
"Sometimes I struggle with a negative mindset where I think I haven’t achieved enough in life – but I forget all about that when I’m running. I think I’m generally a happier, kinder person now. There are social benefits too; you meet some good friends through running."
"One of my aspirations is to run a marathon in less than 3.5 hours. I also have a dream of completing a 100-mile race, which takes 20 hours."
"For anyone who's visually impaired and taking up running, I’d just try to build a habit – jog for 10 minutes, then walk for 10 minutes each day. The goals will come naturally.
"There can be challenges running when you’re partially sighted. I have blind spots in my vision, so I might not see someone in my path. Once you get out there, you may have a few incidents with people, but you learn to develop resilience to deal with these situations.
"I would definitely recommend joining a running club. Community is so important, and helps to keep you going."