< start="330.64" dur="4.35"> bese uqala ukudlalisa ukushaywa kwabo bonke laba bakhiqizi abalishumi abahlukahlukene. Yizo > nal blindness. These retinal disorders affect old and young alike, and more than 200 000 South Africans are going blind due to these conditions. Those that affect children or young adults include retinitis pigmentosa, Stargardt disease or Usher syndrome — deaf blindness. One of the most common causes of vision loss in older Caucasians is age-related macular degeneration. Most of these conditions occur in families with no previous history of blindness. This is due to the fact that in order for the disease to manifest, a gene with a mutation needs to be inherited from both carrier parents, who are themselves not affected. This is the most common form of in- I-Powder yokulungiselela isiraphu kuma-milligram angama-100 kumamililitha amahlanu. Kungaba ne-tint ekhanyayo ephuzi noma emhlophe, enephunga le-sitrobheli. Ngemuva kokuthi i-powder inyibilike, uketshezi olungenangqondo onamafomu okukhanya, aphuzi kancane.