 - one or more papillary signs on conventional color stereo-slides: the presence of a localized loss of neuroretinal rim notch, thinning of the neuroretinal rim, generalized loss of optic rim tissue, optic disc excavation, vertical or horizontal cupdisc ratio greater than 0.5, cup-disc asymmetry between the two eyes greater than 0.2, peripapillary splinter hemorrhages; 