I completed a Masters in Public Health at Emory University in 1994; my thesis was accepted by both the Department of Biostatistics and the Department of Epidemiology. The thesis, titled "Surgically Induced Astigmatism in the PERK Study," is a secondary analysis of the Prospective Evaluation of Radial Keratotomy (PERK) data set. It uses seven different measures of astigmatism change (described in the ophthalmic literature) to examine changes in astigmatism within the PERK data set. Finally, it compares the relative merits of the different measures of astigmatism change.
Alternatively, you can download a PDF version of my thesis.
The display quality is poor, but it prints well. Unfortunately, the PDF file is not searchable.