Mae nifer y bobl yng Nghymru sydd wedi cael diagnosis o fod yn ddall neu sydd wedi colli eu golwg o ganlyniad i ddiabetes bron wedi'i haneru ers cyflwyno rhaglen sgrinio retinopathi diabetig
The number of people in Wales diagnosed as blind or living with sight loss as a result of diabetes has almost halved since the introduction of a new national diabetic retinopathy screening programme.