Table 2 Posterior corneal astigmatism in different groups of patients.

From: A multicenter study of the distribution pattern of posterior corneal astigmatism in Chinese myopic patients having corneal refractive surgery

Groups

N (%)

Mean (D)

SD (D)

Aggregate astigmatism

SMV

7637 (97.55%)

0.34*

0.13

0.01 ± 0.37 @ 1.56

SMH

51 (0.65%)

0.10

0.09

0.03 ± 0.14 @ 179.65

SMO

141 (1.80%)

0.15

0.10

0.02 ± 0.18 @ 90.28

Low myopia

987 (12.60%)

0.32

0.13

0.01 ± 0.35 @ 183.65

Moderate myopia

4744 (60.60%)

0.33

0.13

0.01 ± 0.36 @ 0.84

High myopia

2098 (26.80%)

0.36†

0.14

0.01 ± 0.38 @ 3.19

MA < 0.50 D

2646 (33.80%)

0.29‡

0.11

0.01 ± 0.31 @ 0.62

0.50 D ≤ MA < 1.00 D

2991 (38.20%)

0.32

0.12

0.01 ± 0.34 @ 0.09

1.00 D ≤ MA < 2.00 D

1875 (23.95%)

0.40

0.14

0.01 ± 0.42 @ 0.45

2.00 D ≤ MA < 3.00 D

275 (3.51%)

0.51

0.14

0.06 ± 0.53 @ − 0.99

MA ≥ 3.00 D

42 (0.54%)

0.61

0.16

0.07 ± 0.64 @ 177.19

  1. N number of eyes, D diopter, SD standard deviation, SMV steep meridian vertical, SMH steep meridian horizontal, SMO steep meridian oblique, MA manifest astigmatism.
  2. *P < 0.0001 for comparison of SMV to SMH or SMO.
  3. †P < 0.0001 for comparison of high myopia to low myopia or moderate myopia.
  4. ‡P < 0.0001 for comparison between any two of the MA groups, expect for comparison between the groups of 2.00 D ≤ MA < 3.00 D and MA ≥ 3.00 D.
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