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Table 1 Error of fit with Zernike polynomials with orders between 3 and 8 for central maps and combining central and peripheral maps together

From: In vivo study of corneal responses to increased intraocular pressure loading

  Zernike RMS of error (μm) Map combination RMS of error (μm)
Zernike order Whole central map Reduced area of central mapa Whole maps Reduced area maps*
3 9.5 ± 5.6 4.2 ± 2.2 14.1 ± 9.9 9.0 ± 6.3
4 2.9 ± 3.2 0.8 ± 1.4 11.6 ± 8.9 7.6 ± 6.7
5 2.4 ± 2.4 0.6 ± 1.5 11.5 ± 9.2 7.2 ± 7.1
6 1.9 ± 1.6 0.6 ± 1.2 11.6 ± 7.8 6.6 ± 6.0
7 1.8 ± 1.6 0.8 ± 0.7 10.6 ± 7.2 5.1 ± 3.6
8 1.5 ± 1.2 0.5 ± 0.4 10.1 ± 5.6 4.5 ± 2.4
  1. a Area of maps excluding data contained with an edge area with 0.8 mm width