A Durham man will run 13.1 miles blindfolded as he completes the Great North Run for Fight for Sight later this month.
The half marathon, which takes place in Newcastle on 11 September, will mark the last of a series of races that Alex Cole has completed with a blindfold to raise money for and awareness of the charity.
Mr Cole completed his first race in May and has since ran a number of 5k and half marathon routes over the last five months. On completing the Great North Run, Mr Cole will have covered 43.5 miles blindfolded.
Mr Cole is completing the challenge on behalf of his mum who was diagnosed with dry and wet age-related macular degeneration (AMD) in 2009.
He also works for PolyPhotonix, a health technology business that is developing light-based treatments for diabetic retinopathy and wet and dry AMD.
Mr Cole said: "Witnessing my mum slowly losing her sight and speaking to the patients through my work at PolyPhotonix highlights the devastating impact sight loss can have on someone's life. The work we do is designed to help people living with diabetic retinopathy and I was keen to raise money for Fight for Sight to be able to support research into this and many more conditions."
To support Mr Cole visit his JustGiving page.