Mean IOP Standard Deviation Min Max *Correlation Coefficient, r
Cornea          
Goldmann 16.4 5.1 7.5 30.0 1.0
Tono-Pen 14.5 3.6 7.0 23.5 0.71
Pneumatonometer 19.7 3.9 11.5 29.8 0.92
Superotemporal Sclera          
Tono-Pen 30.0 7.7 16.0 47.5 0.35
Pneumatonometer 29.2 6.4 16.5 51 0.64
Superonasal Sclera          
Tono-Pen 29.0 7.7 15.0 46.0 0.43
Pneumatonometer 28.4 5.8 18.5 41.0 0.54
Inferotemporal Sclera          
Tono-Pen 41.8 14.7 23.5 87.5 0.42
Pneumatonometer 37.8 7.9 21.5 64.5 0.64
Inferonasal Sclera          
Tono-Pen 41.0 12.7 22.5 82.7 0.22
Pneumatonometer 37.2 7.5 21.0 56.5 0.61
*Pearson product moment correlation when the intraocular pressure obtained is compared to the corneal Goldmannapplanation value. All correlations are significant at P < 0.0, except for the inferonasalTono-Pen measurement, which has P > 0.05.
Table 2: Intraocular pressure readings (mmHg) obtained from the cornea versus four scleral quadrants.