TABLE 2.

Corneal Epithelial Cell Parameters for the 6 Age Groups

Age Group	Circularity	Cell Density (Cells/mm3)	Average Size (μm)
20–29	0.727 ± 0.019	7828 ± 1591	132.4 ± 10.6
30–39	0.728 ± 0.022	7635 ± 651	131.1 ± 15.3
40–49	0.718 ± 0.021	7620 ± 504	132.8 ± 7.4
50–59	0.716 ± 0.023	7763 ± 504	128.3 ± 8.3
60–69	0.716 ± 0.020	7799 ± 421	129 ± 7.4
70 and older	0.714 ± 0.020	7719 ± 479	130.3 ± 8.2