No Affected Relatives

Some people who are diagnosed with an inherited sight loss condition may have no known affected relatives.

About half the patients with inherited sight loss fall into this category. A minority of patients with genetic sight loss with no affected relative may have a dominant condition where the ‘fault’ in the gene has occurred for the first time in the patient. It may not be possible to definitely judge which form of genetic sight loss such an individual has; genetic testing may be helpful.