Table 2.

 Distribution of intraocular pressure by vertical cup to disc ratios (CDR) by age in healthy people in the Tehran Eye Study

Vertical CDR	Mean (SD) IOP (mm Hg) (n)
	Age <50 years (n = 2932)	Age ⩾50 years (n = 735)	All ages (n = 3667)
1	14.0 (2.5) (239)	14.3 (3.1) (30)	14.0 (2.6) (269)
2	14.1 (2.4) (1530)	15.1 (3.0) (325)	14.3 (2.5) (1855)
3	14.6 (2.3) (1025)	15.1 (2.9) (321)	14.7 (2.5) (1346)
4	14.5 (2.3) (115)	16.0 (3.7) (51)	15.0 (2.9) (166)
5	14.9 (2.3) (23)	16.5 (4.3) (8)	15.3 (2.9) (31)