Drusen are extracellular deposits that accumulate below the retinal pigment epithelium on Bruch membrane. They appear as slightly raised, yellow subretinal nodules randomly scattered in the macula. 'Drusen' is the plural for 'Druse,' German for 'nodule' or 'crystal' (summary by Bok, 2002, Boon et al., 2008). [from
OMIM]