PMID: 22661473

Gene: ABCA4

HGNCID: HGNC:34

Stage I disease was characterized by central macular atrophy with parafoveal or perifoveal flecks. Where flecks were more numerous and extended anterior to the vascular arcades and/or nasal to the optic disc, then patients were classified as having stage II disease. Although partial resorption of flecks may be present in this stage, more complete resorption of flecks was indicative of stage III disease with choriocapillaris atrophy also within the macula. Widespread RPE and chorioretinal atrophy throughout the fundus defined stage IV disease.27 Based on this classification system, the patients in our study were subdivided into 2 groups, that is those with milder disease (stage I or II) and those with more severe disease (stage III or IV) phenotypes.