Paper Discussed: Chang TC, Congdon NG, Wojciechowski R, et al. Determinants and heritability of intraocular pressure and cup-to-disc ratio in a defined older population. Ophthalmology, July 2005, 112(7) p1186-91 Guest: Nathan Congdon, MD, MPH Associate Professor of Ophthalmology and International Health Johns Hopkins University Schools of Medicine and Public Health Baltimore, Maryland