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Comparison of the IOPen ® and iCare ® rebound tonometers with the Goldmann tonometer in a normal population
Author(s) -
Jorge J.,
Fernandes P.,
Queirós A.,
Ribeiro P.,
Garcês C.,
GonzalezMeijome J. M.
Publication year - 2010
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.2009.00697.x
Subject(s) - goldmann applanation tonometer , intraocular pressure , ophthalmology , medicine , population , optometry , environmental health
This study proposes to evaluate the level of accuracy of intraocular pressure (IOP) measurements of a second generation rebound tonometer (IOPen ® ), taking as references the Goldmann Applanation Tonometer (GAT) and the iCare ® rebound tonometer. The right eyes of 101 consecutive clinical patients were assessed with the three tonometers. The IOPen ® and iCare ® measurements were taken by two different optometrists and the GAT by an ophthalmologist. In this study, statistically significant differences were found when comparing the IOPen ® tonometer with the other two tonometers ( p < 0.001). The IOPen ® underestimated the IOP value when compared to the GAT and the iCare ® (mean differences were 2.94 ± 4.65 mmHg and 3.20 ± 4.72 mmHg (mean ± S.D.), respectively). The frequency distribution of differences demonstrated that in more than 55% of measurements the IOP readings differed by more than 3 mmHg between the IOPen ® and the GAT. Based on the present population study, these results suggest that IOPen ® measurements should be interpreted with caution.