A man who has a rare form of dementia that affects his vision is taking on a 10km run in Kew Gardens with his daughter to raise money for pioneering research.

Peter Mumford from Herefordshire, who has posterior cortical atrophy (PCA), is set to run the Kew Gardens 10k Richmond RUNFEST on Saturday, September 15 with his daughter Sophie Hancox to raise money for Alzheimer’s Research UK.

PCA is a rare variant of Alzheimer’s disease that damages the part of the brain that makes sense of what the eyes are seeing. Those living with PCA usually experience problems with their vision, such as blurred vision, light sensitivity and issues with colour, depth and distance perception.

Peter, 58, has recently taken up running after he had to give up cycling because it had become too dangerous for him on the roads and golf because he was struggling to see the ball. He trains with Sophie, 30, when she visits at weekends.

He said: “I’ve always kept myself fit and want to continue. Running is a way for me to maintain my independence.

“I used to compete in time-trials with Hereford Wheelers but I can’t anymore as I have to be so careful on roads.

“I also played golf regularly, but I now struggle to see the ball. I can walk right over my ball on the fairway and not see it and once on the green I putted the ball to a leaf mistaking it for the hole.

“Running does have challenges for me. For example, closed drains can look like they are open. It took me a long time to convince myself that they are flat, and I can step on them.

“I run on a cycle track that I know well, as it’s safer for me. I have to be very careful with my footing.”

When Peter first started noticing problems with his vision, he went to the opticians, who found nothing wrong with his eyes. Peter thought he might have had a stroke or might have a brain tumour, but an MRI scan eventually revealed he had PCA. He said: “One of the first problems I noticed was when driving I found car headlights appeared to be a lot brighter, like flares, and they would blind me.

“One of the hardest things for me was having to give up work. I’ve always worked in car body shops, as a paint-sprayer, but I found I was missing bits and struggling to see the lines.”

Sophie, who works as a Distribution Lead for British Airways but is leaving to join the RAF next month, said: “I ran the Berlin Marathon last year for Alzheimer’s Research UK. I was originally motivated to sign up for the race and fundraise for the charity as my nan has Alzheimer’s, but then my dad was diagnosed with PCA and it made me even more determined to support research.”

Peter and Sophie have so far raised £1,000 for the UK’s leading dementia research charity, smashing their target of £750. To sponsor them go to www.justgiving.com/fundraising/Sophie-Hancox2