Most of us probably didn't contribute much to society as teenagers other than some dodgy haircuts and questionable style choices.

However, one 18-year-old from Welling is proving age shouldn't be a barrier for those looking to make a change as his outstanding fundraising efforts have helped develop a new treatment for his rare, debilitating eye disease.

Tommy Salisbury was just four years old when he was diagnosed with a genetic condition called choroideremia, something which leads to progressive sight loss later in life.

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Until now there has been no treatment, but after raising more than £500,000, Tommy and his family have helped fund clinical trials for a gene therapy that is already helping to halt the disease and restore sight.

Tommy is not stopping though and is now taking on a new challenge after deciding to run in this year's London Marathon on behalf of eye-charity Fight for Sight.

Tommy said: "My family and I know the power of fundraising and research to bring about new treatments and make a difference for people with sight loss which is why I am running the marathon this year.

"I have supported people on the other side of the fence for so many years and now that I am 18 I wanted it to be my turn.

"I am so grateful to have my friends running with me who have been there since the start of this journey.

"It’s only through research that we will find a breakthrough for my condition and others."

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He will be joining 16 runners taking part in the world-famous running event for the eye research charity.