Internal Astigmatism and Its Role in the Growth of Axial Length in School-Age Children
Table 1
Axial length, IA, and DIA in school children in Jing’an District 2nd Primary School 2016.
Axial length (mm)
Sphere (−D)
TA (−D)
CA (−D)
IA (−D)
DIA (−D)
Age (yrs)
Male
Female
Male
Female
Male
Female
Male
Female
Male
Female
Male
Female
7
22.93 ± 0.56
22.56 ± 0.58
0.16 ± 0.36
0.29 ± 1.13
0.91 ± 0.93
0.6 ± 0.44
0.92 ± 0.89
0.6 ± 0.52
0.60 ± 0.37
0.61 ± 0.36
0.34 ± 0.24
0.31 ± 0.30
8
23.15 ± 0.72
22.60 ± 0.78
0.31 ± 0.77
0.41 ± 0.97
0.89 ± 0.75
0.85 ± 0.56
0.84 ± 0.70
0.85 ± 0.62
0.63 ± 0.57
0.64 ± 0.37
0.43 ± 0.62
0.35 ± 0.30
9
23.41 ± 0.84
22.94 ± 0.93
0.37 ± 0.65
0.64 ± 1.29
0.79 ± 0.62
0.84 ± 0.75
0.83 ± 0.67
0.84 ± 0.74
0.58 ± 0.37
0.72 ± 0.42
0.36 ± 0.26
0.35 ± 0.34
10
23.37 ± 0.77
23.08 ± 0.93
0.51 ± 0.97
0.78 ± 1.30
0.85 ± 0.63
0.76 ± 0.58
0.88 ± 0.65
0.75 ± 0.60
0.63 ± 0.45
0.61 ± 0.43
0.41 ± 0.40
0.31 ± 0.39
11
23.71 ± 1.02
23.26 ± 1.19
0.97 ± 1.31
1.11 ± 1.40
0.89 ± 0.72
1.04 ± 0.85
0.88 ± 0.74
1.02 ± 0.83
0.57 ± 0.42
0.69 ± 0.48
0.31 ± 0.36
0.32 ± 0.39
12
24.16 ± 1.06
23.78 ± 1.06
1.22 ± 1.37
1.67 ± 1.65
1.05 ± 0.79
0.90 ± 0.49
1.10 ± 0.84
0.84 ± 0.51
0.68 ± 0.49
0.71 ± 0.35
0.40 ± 0.40
0.32 ± 0.34
Average
23.45 ± 0.92
23.01 ± 0.99
0.58 ± 1.04
0.76 ± 1.34
0.89 ± 0.73
0.83 ± 0.64
0.90 ± 0.74
0.82 ± 0.66
0.61 ± 0.46
0.66 ± 0.41
0.38 ± 0.42
0.33 ± 0.33
TA: total astigmatism; CA: corneal astigmatism; IA: internal astigmatism; DIA: difference of internal astigmatism between both eyes. The axial length of boys was longer significantly than that of girls (, ). A linear relationship between axial length and age was found in both genders (, in male; , in female). And there was no significant difference in IA and DIA between genders (, for IA; , ). IA and DIA did not grow significantly with age in both genders (, in male, and , in female, resp.).
