Fig. 1. Ocular fundus chart. Inner circle represents equator of eye; middle circle represents ora serrata; outer circle represents anterior border of pars plana ciliaris. Radiating lines represent meridians numbered according to clock hours. (Straatsma BR, Foos RY, Spencer LM: The retina: Topography and clinical correlations. In: Transactions of the New Orleans Academy of Ophthalmology: Symposium on Retina and Retinal Surgery. St Louis: CV Mosby, 1969.)