In the 14th century, spectacle lenses referred to as Diyatharippu made by hereditary workers in Uda Dumbara. This industry was started, it is said, during the time of Bhuwaneka Bahu IV (1344-1353).The most fascinating craftsman, Mr.Gunasoma in Kahambe, is an eighth generation craftsman (and probably the last) of the Diyatharippu paramparaawa—the first in the world to have made spectacles as it is claimed.