Age-group
Luminance	Pupil	20–29 y(n = 20)	30–39 y(n = 18)	40–49 y(n = 32)	50–59 y(n = 32)	60–69 y(n = 21)	70–79 y(n = 23)
4 log cd/m2	Calculated pupil, mm	2.70 ± 0.01	2.66 ± 0.01	2.61 ± 0.01	2.57 ± 0.01	2.54 ± 0.01	2.49 ± 0.01
3 log cd/m2	Calculated pupil, mm	3.53 ± 0.03	3.41 ± 0.03	3.41 ± 0.03	3.29 ± 0.03	3.18 ± 0.03	3.07 ± 0.02
2 log cd/m2	Calculated pupil, mm	4.80 ± 0.05	4.56 ± 0.06	4.32 ± 0.07	4.10 ± 0.07	3.90 ± 0.05	3.66 ± 0.06
1 log cd/m2	Calculated pupil, mm	6.13 ± 0.08	5.78 ± 0.09	5.41 ± 0.10	5.08 ± 0.10	4.77 ± 0.07	4.41 ± 0.09
0 log cd/m2	Calculated pupil, mm	7.07 ± 0.10	6.63 ± 0.11	6.17 ± 0.13	5.76 ± 0.13	5.38 ± 0.09	4.93 ± 0.11
	Actual pupil, mm	7.03 ± 0.15	6.63 ± 0.11	6.17 ± 0.13	5.76 ± 0.13	5.38 ± 0.09	4.93 ± 0.11
	Mean difference, mm	0.04	0.00	0.00	0.00	0.00	0.00
	No. eyes where actual pupil size < calculated	2	2	0	0	0	0
–1 log cd/m2	Calculated pupil, mm	7.56 ± 0.11	7.08 ± 0.12	6.57 ± 0.14	6.12 ± 0.14	5.70 ± 0.10	5.20 ± 0.12
	Actual pupil, mm	7.47 ± 0.29	7.00 ± 0.17	6.55 ± 0.16	6.11 ± 0.15	5.70 ± 0.10	5.20 ± 0.12
	Mean difference, mm	0.10	0.08	0.02	0.00	0.00	0.00
	No. eyes where actual pupil size < calculated	3	4	2	1	0	0
–2 log cd/m2	Calculated pupil, mm	7.78 ± 0.12	7.28 ± 0.12	6.75 ± 0.14	6.28 ± 0.15	5.84 ± 0.10	5.33 ± 0.12
	Actual pupil, mm	7.64 ± 0.35	7.15 ± 0.24	6.71 ± 0.19	6.26 ± 0.17	5.84 ± 0.10	5.33 ± 0.12
	Mean difference, mm	0.14	0.13	0.04	0.01	0.00	0.00
	No. eyes where actual pupil size < calculated	4	5	3	3	1	0
–3 log cd/m2	Calculated pupil, mm	7.87 ± 0.12	7.36 ± 0.13	6.82 ± 0.15	6.34 ± 0.15	5.90 ± 0.10	5.38 ± 0.13
	Actual pupil, mm	7.72 ± 0.38	7.20 ± 0.27	6.78 ± 0.21	6.32 ± 0.18	5.89 ± 0.10	5.38 ± 0.12
	Mean difference, mm	0.16	0.15	0.04	0.02	0.01	0.00
	No. eyes where actual pupil size < calculated	4	6	3	3	1	0