A horizontal section through the pigment epithelium layer shows how densely packed these cells are resulting in a hexagonal shape. Pigment granulus are mostly in the apical part of the cell. The variation in pigment content is caused by the imperfect horizontal section. ( AFIP, Washinton DC)
Naumann, G.O.H., Prof. Dr. med., Univ.-Augenklinik, Erlangen, Germany