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. Author manuscript; available in PMC: 2018 Aug 9.
Published in final edited form as: Am J Ophthalmol. 2015 Jun 9;160(3):453–462.e2. doi: 10.1016/j.ajo.2015.06.001

FIGURE 1.

FIGURE 1

Frequency distribution of pachymetry Zernike analysis (PZA) coefficients in normal (Left column) and keratoconus (Right column) eyes. (Top left) Frequency distribution of root mean square of second-order PZA Zernike coefficients in normal eyes. (Top right) Frequency distribution of root mean square of second-order PZA Zernike coefficients in keratoconus eyes. (Middle left) Frequency distribution of root mean square of third-order PZA Zernike coefficients in normal eyes. (Middle right) Frequency distribution of root mean square of third-order PZA Zernike coefficients in keratoconus eyes. (Bottom left) Frequency distribution of root mean square of higher-order (fourth order and higher) PZA Zernike coefficients in normal eyes. (Bottom right) Frequency distribution of root mean square of higher-order PZA Zernike coefficients in keratoconus eyes.