Table 5.

Correlation Between Refractive Errors, Keratometry and Age Groups

Variable	Age Groups	n	Mean	SD	F	P Value*
Sphere					4.6	<0.01*
	18–29	28	−1.7	1.6
	30–39	13	−1.0	1.8
	40–49	16	−1.1	1.9
	>50	40	0.04	2.1
Cylinder					3.018	0.034*
	18–29	27	−0.6	0.5
	30–39	14	−1.1	1.1
	40–49	16	−1.0	0.5
	>50	40	−0.9	0.5
Flat K					3.103	0.03*
	18–29	27	43.0	1.6
	30–39	14	42.8	1.6
	40–49	15	41.9	1.2
	>50	40	43.3	1.4
Steep K					3.134	0.029*
	18–29	27	43.8	1.7
	30–39	14	44.1	2.0
	40–49	15	42.7	1.1
	>50	40	44.2	1.6

^* P is significant at 0.05.