1. Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 e-mail:
2. Structural Biophysics Group, School of Optometry and Vision Sciences, Cardiff University, Cardiff CF24 4HQ, Wales, UK
3. Glaucoma Center of Excellence, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287
4. Diamond Light Source, Didcot, Oxfordshire OX11 0DE, UK
5. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218 e-mail: