Table 1.

Demographic data among the three groups.

	Group 1 (20 eyes)	Group 2 (20 eyes)	Group 3 (20 eyes)
1. Sex
Male	16	18	14
Female	4	2	6
2. Age
Mean ± SD	45.2 ± 7.3	49.1 ± 2.3	39.1 ± 13.1
Range	30–50	29–52	30–52
3. Laterality
Right	18	14	12
Left eye	2	6	8