For the purpose of OCT categorization, measured thickness of more than 300um in the central foveal area and more than 400um in the surrounding macular area in at least 3 examination lines with or without intraretinal cystic spaces or epiretinal membrane is defined as increase of macular thickness. Visible cystic spaces in and immediate adjacent to the fovea is categorized as foveal cysts. The presence of clear optical empty space between pigment epithelium and neurosensory retina are defined foveal detachment.