3D Curvelet-Based Segmentation and Quantification of Drusen in Optical Coherence Tomography Images

Table 1

Four defined categories by AREDS depending on the stages of AMD.

Category 1	Category 2	Category 3	Category 4
No AMD	Early stage AMD	Intermediate AMD	Advanced AMD
No or a few small drusen	Several small sized drusen or a few medium-sized drusen in one or both eyes	Many medium-sized drusen or one or more large drusen in one or both eyes	Degeneration of the deepest cells of the retina (in one eye only) or abnormal and fragile blood vessels known as choroidal neovascularization under the retina (wet form)