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Table 1 Mean and range of descriptors of the four HOA ablation profile islands identified in POE eyes

From: Characterization of postoperative LASIK ectasia features on higher-order aberration excimer ablation maps

Descriptors

Ablation island #1

Ablation island #2

Ablation island #3

Ablation island #4

Mean ± SD

(CV %)

Range

Mean ± SD

(CV %)

Range

Mean ± SD

(CV %)

Range

Mean ± SD

(CV %)

Range

Distance (mm)

3.2 ± 0.1

(3.9%)

2.8 to 3.4

1.4 ± 0.2

(15.5%)

1.0 to 1.8

1.4 ± 0.4

(30.1%)

0.8 to 2.8

3.2 ± 0.2

(5.0%)

2.9 to 3.5

Position (°)

90.1 ± 65.9

(73.2%)

1.5 to 357.9

82.7 ± 47.3

(57.2%)

5.0 to 172.5

249.3 ± 17.3

(6.9%)

213.2 to 294.1

137.0 ± 120.3

(87.8%)

9.1 to 352.0

Orientation (°)

88.8 ± 58.1

(65.4%)

8.9 to 166.6

104.7 ± 68.4

(65.3%)

2.2 to 179.8

101.9 ± 67.7

(66.4%)

6.2 to 179.3

78.0 ± 24.6

(31.5%)

37.8 to 112.1

Circularity (%)

38.6 ± 16.5

(42.7%)

12.4 to 71.0

69.4 ± 9.2

(12.9%)

48.4 to 97.6

74.9 ± 14.0

(18.7%)

47.7 to 96.5

56.1 ± 15.5

(27.6%)

32.8 to 84.2

Diameter (mm)

5.0 ± 1.9

(37.7%)

2.5 to 9.2

3.3 ± 1.0

(31.6%)

1.2 to 5.2

2.7 ± 1.0

(35.9%)

1.8 to 6.9

2.6 ± 0.6

(22.8%)

1.8 to 3.6

Area (mm2)

3.9 ± 1.4

(35.3%)

1.6 to 7.0

3.8 ± 1.6

(42.3%)

0.5 to 7.4

3.4 ± 1.7

(50.7%)

1.4 to 10.0

1.7 ± 0.7

(42.6%)

0.7 to 2.9

Depth (µm)

34.8 ± 18.9

(54.4%)

12.3 to 77.5

11.5 ± 6.9

(60.5%)

3.6 to 25.5

32.5 ± 18.8

(50.7%)

12.1 to 74.3

23.4 ± 12.6

(51.7%)

12.6 to 46.1

  1. Ablation island #1 = deep peripheral superior crescent; Ablation island #2 = shallow paracentral superior ablation island; Ablation island #3 = deep paracentral inferior ablation island; Ablation island #4 = deep peripheral crescent, only applicable to cases presenting with two deep peripheral crescents; CV = Coefficient of variation, POE = Postoperative LASIK ectasia