Submitted for Publication: March 14, 2011; final revision received July 14, 2011; accepted July 16, 2011.
Author Contributions: Dr Salgado and Mr Vilson contributed equally to this work.
Financial Disclosure: None reported.
Funding/Support: This work was supported by grant RO1-EY019529 (Dr Bernstein), an unrestricted grant from the Sugarman Fund (Department of Ophthalmology and Visual Sciences, University of Maryland at Baltimore), and an unrestricted gift from the Hirschhorn Foundation (Dr Miller).
Additional Contributions: We thank Len Levin, MD (University of Wisconsin), for providing the unstained clinical NAION slide from his clinical collection; Agnes Azimzadeh, MD, for providing the primate-specific ED1 antibody; Charles Eberhart, MD, for providing us with normal human ON tissue slides; and Adam Puche, PhD, for providing the fluorescent mounting medium. The technical assistance of Yan Guo, MD, and James Nicholson are gratefully acknowledged.