Table 2.

Pupil diameter of illuminance stratification according to age group and refractive error group.

	Total	Aged 20–39 yr (n = 39)	Aged 40–49 yr (n = 33)	Aged 50–59 yr (n = 59)	Aged 60–69 yr (n = 88)
Illuminance	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
Scotopic
Emmetropes	5.54 (0.75)	5.83 (0.72)	6.02 (0.76)	5.56 (0.70)	5.24 (0.69)
Hyperopes	5.19 (0.76)	4.40 (0.80)	5.25 (0.50)	5.41 (0.74)	5.22 (0.71)
Myopes	5.64 (0.86)	5.90 (0.93)	5.89 (0.68)	5.31 (0.89)	5.49 (0.78)
P value	<.001	<.001	.034	.384	.219
Mesopic low
Emmetropes	5.41 (0.73)	5.72 (0.61)	5.88 (0.78)	5.45 (0.70)	5.09 (0.68)
Hyperopes	5.13 (0.71)	4.34 (0.46)	5.18 (0.44)	5.32 (0.67)	5.15 (0.71)
Myopes	5.51 (0.87)	5.85 (0.84)	5.76 (0.69)	5.15 (0.94)	5.31 (0.76)
P value	<.001	<.001	.058	.237	.411
Mesopic high
Emmetropes	5.12 (0.75)	5.51 (0.62)	5.48 (0.78)	5.16 (0.73)	4.79 (0.67)
Hyperopes	4.86 (0.70)	4.39 (0.37)	4.94 (0.39)	4.98 (0.75)	4.87 (0.71)
Myopes	5.19 (0.90)	5.66 (0.89)	5.42 (0.72)	4.78 (0.94)	4.98 (0.71)
P value	<.001	<.001	.173	.121	.486

All persons (N = 221).

Values presented as mean ± SD for continuous variables.

P value is calculated as analysis of variance.

SD = standard deviation.