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) | 0.008 | 0.02 |
| 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) | <0.0001 | 0.02 |
| 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) | 0.16 | 0.44 |