Table 3.

The average central corneal thickness (μm) in each group

Age (years)	Number of eyes examined	Minimal value	Maximal value	Average	Standard deviation
20–29	55	474	646	563	44
30–39	45	477	640	561	36
40–49	45	494	681	559	42
50–59	55	459	647	553	43
60–69	55	495	630	555	35
70–79	55	448	672	551	46
80–89	48	430	637	540	35