Rhoddwyd 339 yn llai o dystysgrifau newydd ar gyfer pob lefel o nam ar y golwg oherwydd cyfuniad o achosion yn 2014-15, o gymharu â 2007-08Roedd 22 yn llai o bobl y gwyddys bod diabetes arnynt a oedd wedi colli golwg oherwydd eu diabetes yn benodol. Roedd gostyngiad o 49% mewn tystysgrifau newydd ar gyfer nam difrifol ar y golwg, o 31.3 i 15.8 ym mhob 100,000 o boblYn ystod y cyfnod arsylwi hwn, cafodd 52,229 (40%) yn rhagor o bobl yng Nghymru ddiagnosis bod diabetes arnynt.Wrth groesawu'r ymchwil, dywedodd Gweinidog Iechyd y Cyhoedd, Rebecca Evans:
There were 339 fewer new certifications for all levels of sight loss from any cause combined  in 2014-15, compared with 2007-08There were 22 fewer people with known diabetes with sight loss due specifically to their diabetes. There was a 49% fall in new certifications for severe sight impairment, from 31.3 to 15.8 per 100,000 peopleDuring this observation period, 52,229 (40%) more people were diagnosed with diabetes in Wales.Welcoming the research, Public Health Minister, Rebecca Evans said: