Sample details and treatments.

Details of pre-treatment tissue hydration (recorded at the time of data collection), classification and UVA cross-linking treatment (hypo-osmolar/iso-osmolar riboflavin solution) are shown for each sample. Each cornea has been classified as being either ‘unswollen’ (at or below a physiological hydration of H = 3.2) or ‘swollen’ (above physiological hydration).*The pre-treatment hydration of samples N10, N12 and N14 was assumed to be the same as that of their untreated pair (N11, N13 and N15 respectively).