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Table 1 Comparison of corneal aberration measurements between SS-OCT and Placido + SD-OCT (5 mm zone; pupil centered)

From: Comparison of corneal aberrations from anterior segment swept source OCT versus Placido-topography combined spectral domain OCT in cataract patients

Parameter

Mean ± SD (absolute mean)

Range

P*

 

SS-OCT

Placido + SD-OCT

SS-OCT

Placido + SD-OCT

 

Anterior cornea (μm)

     

 Z(2, − 2) Oblique astigmatism

0.14 ± 0.28 (0.23)

0.16 ± 0.27 (0.24)

 − 0.48, + 1.06

 − 0.44, + 0.98

0.16

 Z(2, + 2) WTR/ATR astigmatism

 − 0.02 ± 0.50 (0.38)

 − 0.02 ± 0.47 (0.36)

 − 1.26, + 1.25

 − 1.20, + 1.17

0.71

 Z(3, − 3) Oblique trefoil

 − 0.10 ± 0.10 (0.12)

 − 0.10 ± 0.12 (0.13)

 − 0.34, + 0.16

 − 0.47, + 0.24

0.53

 Z(3, − 1) Vertical coma

 − 0.01 ± 0.15 (0.11)

 − 0.06 ± 0.17 (0.13)

 − 0.57, + 0.56

 − 0.87, + 0.45

0.002

 Z(3, + 1) Horizontal coma

 − 0.15 ± 0.13 (0.17)

 − 0.14 ± 0.13 (0.16)

 − 0.58, + 0.29

 − 0.47, + 0.34

0.37

 Z(3, + 3) Horizontal trefoil

0.02 ± 0.10 (0.08)

0.02 ± 0.11 (0.08)

 − 0.24, + 0.26

 − 0.32, + 0.32

0.55

 Z(4,0) Spherical aberration

0.17 ± 0.07 (0.17)

0.15 ± 0.07 (0.15)

0.00, + 0.56

 − 0.02, + 0.57

 < 0.001

 HOA RMS

0.36 ± 0.10 (0.36)

0.37 ± 0.14 (0.37)

 + 0.13, + 0.69

 + 0.19, + 1.01

0.43†

Total cornea (μm)

     

 Z(2, − 2) Oblique astigmatism

0.14 ± 0.26 (0.22)

0.16 ± 0.25 (0.23)

 − 0.43, + 0.89

 − 0.40, + 0.86

0.31

 Z(2, + 2) WTR/ATR astigmatism

0.16 ± 0.47 (0.38)

0.13 ± 0.45 (0.36)

 − 0.99, + 1.26

 − 0.99, + 1.31

0.38

 Z(3, − 3) Oblique trefoil

 − 0.09 ± 0.10 (0.11)

 − 0.09 ± 0.12 (0.12)

 − 0.31, + 0.16

 − 0.45, + 0.25

0.32

 Z(3, − 1) Vertical coma

 − 0.03 ± 0.15 (0.11)

 − 0.07 ± 0.17 (0.14)

 − 0.62, + 0.53

 − 0.93, + 0.42

0.01

 Z(3, + 1) Horizontal coma

 − 0.15 ± 0.07 (0.16)

 − 0.14 ± 0.12 (0.15)

 − 0.55, + 0.25

 − 0.47, + 0.31

0.41

 Z(3, + 3) Horizontal trefoil

0.02 ± 0.09 (0.08)

0.01 ± 0.13 (0.09)

 − 0.24, + 0.23

 − 0.70, + 0.30

0.34

 Z(4,0) Spherical aberration

0.15 ± 0.07 (0.15)

0.14 ± 0.08 (0.14)

0.00, + 0.53

 − 0.08, + 0.55

0.006

 HOA RMS

0.34 ± 0.11 (0.34)

0.37 ± 0.16 (0.37)

 + 0.12, + 0.73

 + 0.19, + 1.10

0.04†

Posterior cornea (μm)

 Z(2, − 2) Oblique astigmatism

0.00 ± 0.05 (0.04)

 − 0.01 ± 0.08 (0.04)

 − 0.17, + 0.12

 − 0.60, + 0.14

0.31†

 Z(2, + 2) WTR/ATR astigmatism

0.18 ± 0.08 (0.18)

0.16 ± 0.19 (0.18)

0.01, + 0.39

 − 1.59, + 0.53

 < 0.001†

 Z(3, − 3) Oblique trefoil

0.01 ± 0.02 (0.02)

0.01 ± 0.04 (0.03)

 − 0.03, + 0.04

 − 0.23, + 0.10

0.76†

 Z(3, − 1) Vertical coma

 − 0.02 ± 0.03 (0.03)

 − 0.01 ± 0.03 (0.03)

 − 0.12, + 0.07

 − 0.19, + 0.12

 < 0.001†

 Z(3, + 1) Horizontal coma

0.01 ± 0.01 (0.01)

0.01 ± 0.02 (0.01)

 − 0.04, + 0.04

 − 0.03, + 0.10

0.16†

 Z(3, + 3) Horizontal trefoil

 − 0.01 ± 0.01(0.01)

 − 0.01 ± 0.06 (0.02)

 − 0.04, + 0.03

 − 0.59, + 0.06

0.46†

 Z(4, 0) Spherical aberration

 − 0.02 ± 0.01(0.02)

 − 0.01 ± 0.02 (0.01)

 − 0.05, + 0.01

 − 0.17, + 0.02

 < 0.001†

 HOA RMS

0.05 ± 0.02 (0.05)

0.06 ± 0.07 (0.06)

 + 0.01, + 0.14

 + 0.01, + 0.66

0.03†

  1. SD-OCT = spectral-domain optical coherence tomography; SS-OCT = swept-source optical coherence tomography; SD = standard deviation; WTR = with-the-rule; ATR = against-the-rule; HOA = higher-order aberration; RMS = root mean square
  2. *Paired t-test, significant at P < 0.05
  3. †Wilcoxon signed rank test, significant at P < 0.05. P values indicated in bold refer to statistically significant results
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Eye and Vision

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