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Table 5 Corneal aberrometric based on Zernike polynomials data before-fitting and after 3 months of contact lens wear

From: Characterization and prediction of the clinical result with a specific model of mini-scleral contact lens in corneas with keratoconus

Variable

(6-mm pupil)

Pre-fitting

After 3 months of CL wear

Mean (SD)

Median (range)

Mean (SD)

Median (range)

P value

Anterior corneal surface

 HOA RMS (μm)

3.02 (0.56)

3.28 (0.55 to 7.28)

4.14 (2.65)

2.38 (1.06 to 10.77)

0.380

 Coma RMS (μm)

2.47 (0.53)

2.66 (0.11 to 5.58)

2.94 (1.68)

2.08 (0.50 to 5.82)

0.653

 SA (μm)

 − 0.21 (0.23)

 − 0.17 (− 2.01 to 1.41)

 − 0.30 (0.82)

 − 0.06 (− 2.99 to 0.51)

0.110

 Residual RMS (μm)

1.50 (0.30)

1.32 (0.53 to 4.22)

2.51 (2.22)

1.10 (0.67 to 9.70)

0.779

Posterior corneal surface

 HOA RMS (μm)

0.76 (0.16)

0.7 (0.13 to 1.99)

0.89 (0.43)

0.84 (0.21 to 1.73)

0.765

 Coma RMS (μm)

0.60 (0.13)

0.59 (0.06 to 1.54)

0.68 (0.33)

0.70 (0.14 to 1.25)

0.806

 SA (μm)

0.08 (0.08)

0.04 (− 0.46 to 0.63)

0.01 (0.22)

 − 0.06 (− 0.21 to 0.77)

0.634

 Residual RMS (μm)

0.38 (0.10)

0.33 (0.11 to 1.31)

0.48 (0.29)

0.36 (0.11 to 1.21)

0.399

  1. SD = standard deviation; RMS = root mean square; HOA = high-order aberrations; SA = spherical aberration