1. From the Laboratory for Nutrition and Vision Research, JM-USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts;
2. Department of Cell Biology and Human Anatomy, University of California—Davis School of Medicine, Davis, California;
3. Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland; and
4. Centre for Vision and Vascular Science, Queen's University Belfast, Belfast, Northern Ireland, United Kingdom.