Table 1

Goldmann applanation tonometry mean IOP (SD) (range) measurements before, during necktie tightening, and after loosening the necktie

Normal (n=20)Glaucoma (n=20)
Mean IOP before tightening (mm Hg) (range)15.3 (2.6) (10 to 20)16.9 (3.8) (12.5 to 25)
Mean IOP during tightening (mm Hg) (range)17.9 (3.9) (12 to 26)17.9 (4.9) (12 to 29)
Mean IOP after loosening (mm Hg) (range)14.6 (2.1) (9.5 to 18)16.6 (4.2) (11 to 27.5)
Mean IOP difference (before and during tightening) (mm Hg) (range)2.6 (3.9) (−3 to +14)1.0 (1.8) (−2 to +4.5)
p Value (paired t test)0.0080.02
Mean IOP difference (during tightening and after loosening) (mm Hg) (range)3.3 (2.7) (−10 to +0.50)1.3 (2.1) (−8.5 to +1)
p Value (paired t test)<0.00010.02
Mean IOP difference (before tightening and after loosening) (mm Hg) (range)0.7 (2.1) (−4 to +4)0.25 (1.4) (−4 to +2.5)
p Value (paired t test)0.160.44