How to diagnose Best vitelliform macular dystrophy ?
How is Best vitelliform macular dystrophy diagnosed? Best vitelliform macular dystrophy (BVMD) may be diagnosed based on the findings on an exam of the fundus (the interior surface of the eye opposite the lens); an electrooculogram (EOG); and the family history. An eye exam may include other tests as well. A fundus exam may show a typical yellow yolk-like macular lesion. An EOG is usually abnormal in affected people, but occasionally, people with signs of BVMD and a mutation in the BEST1 gene have a normal EOG. The family history in affected people is often consistent with either autosomal dominant or autosomal recessive inheritance. Genetic testing may also be used to make a diagnosis of BVMD. A BEST1 mutation is detected in about 96% of affected people who have an affected family member. In people with no family history of BVMD, the mutation detection rate ranges between 50-70%. The exact type of genetic test ordered to confirm a diagnosis may depend on a person's ancestry, family history, and/or whether other eye disorders are also being considered.