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Spatial variation of the shear and longitudinal elastic moduli of ex vivo human lenses along the equatorial axis. (a) Young lenses (n = 2, 4-mm disks from the left and right eyes of a 26-year-old donor). (b) Old lenses (n = 4–8, 4-mm disks from left and right eyes of three donors at ages of 50, 60, and 62). Solid dots, measured data from each individual sample; open squares, average value of the data within each layer; and error bars, standard variation.
