Table 1.

Demographic data on normal subjects between the mean for each of the six age groups and each of ocular parameters

Age (years)	No. of subjectives (male/female)	Mean age (±SD*)	Refractive error SE† (diopters)
19–29	44 (21/23)	24.52 (±2.67)	−3.95
30–39	50 (28/22)	33.88 (±2.85)	−3.31
40–49	45 (23/22)	44.05 (±2.98)	−2.58
50–59	84 (50/34)	54.71 (±2.82)	−0.19
60–69	66 (33/33)	63.66 (±2.76)	−0.24
70–82	25 (14/11)	73.88 (±3.84)	0.23
Total	314 (169/145)	49.35 (±14.85)	−1.59

Notes:

^*Standard deviation;

^†Spherical equivalent.