The Prime Minister was speaking at a reception in Downing Street last night attended by Sightsavers CEO Dr Caroline Harper.
Journalists from the newspaper visited Uganda to see how the country is tackling this infectious neglected tropical disease, thanks to help from UK Aid.
People aged over 65 can now have a free eye examination while collecting their pension, and can then be referred for treatment for conditions such as cataracts or blinding trachoma.
The election took place during the IDDC general assembly, held in May in Birmingham, UK. Dom has worked at Sightsavers for 13 years and has been a member of the IDDC board since 2015.
More than 4,000 volunteers, most of them women, went door to door with medication to treat the potentially blinding disease.
Sightsavers and five other organisations have issued an open letter that aims to put pressure on Commonwealth governments, ahead of next week's Commonwealth Heads of Government Meeting in London.
A call for better gender representation and geographical spread in the United Nations disability committee has seen 17 women from six continents put forward for election in 2018.