Abstract
Abstract Purpose: To validate the comparative measurements of intraocular pressure performed with IcarePRO tonometer (IPT) in relation to Goldmann applanation tonometer (GAT) and non-contact tonometer (NCT), as well as to evaluate the influence of central corneal thickness (CCT) on these values. Methods: This was a prospective and comparative study conducted during 6 months in the Department of Ophthalmology, Hospital de Braga, Portugal. The study population comprised two groups: healthy adults and adults with primary open angle glaucoma (POAG). The IOP values were obtained by the three tonometers and the order of execution was randomly selected. CCT values were obtained by ultrasonic pachymetry. Results: A total of 168 eyes (74 with diagnosis of POAG and 94 healthy) of 84 patients were included in this study. The mean IOP values obtained by IPT, GAT and NCT were 17.36±3.78 mmHg; 14.59±3.32 mmHg; and 17.04±4.01 mmHg, respectively. The comparison between IPT and NCT did not reveal statistically significant differences in the two groups studied. However, statistically significant differences were obtained between IPT and GAT values (p <0.001). The IOP values, recorded by all the tonometers, were significantly and positivily correlated with the CCT (p <0.001). Conclusion: IOP readings measured by IPT are comparable with those obtained by NCT, but higher than those obtained by the GAT. CCT values are correlated with IOP measurements with IPT, as it does in GAT and NCT, and should be always taken into consideration.
Highlights
Glaucoma, a chronic and neurodegenerative optic neuropathy, is a main global cause of irreversible blindness
The Goldmann applanation tonometer (GAT) is considered the gold standard in tonometry according to current references.[4,5,6] it presents disadvantages such as: being an operator-dependent method; requiring the use of topical anesthesia; and being difficult to perform in children and bedridden patients.[7,8,9,10,11,12,13] Among other alternatives, the Icare PRO tonometer (IPT) provides a new type of portable reading using the principle of impact or rebound to measure intraocular pressure (IOP).The calculation is made by parametric variation of the motion after a magnetic probe reaches the cornea
Statistical analysis between IPT and Non-Contact tonometer (NCT) revealed an agreement between IPT and NCT readings in healthy [t(92)=0.703, p=0.484, d=0.112] and glaucomatous eyes [t(72)=1.177,p=0.234, d=0.124]
Summary
A chronic and neurodegenerative optic neuropathy, is a main global cause of irreversible blindness. The Goldmann applanation tonometer (GAT) is considered the gold standard in tonometry according to current references.[4,5,6] it presents disadvantages such as: being an operator-dependent method; requiring the use of topical anesthesia; and being difficult to perform in children and bedridden patients.[7,8,9,10,11,12,13] Among other alternatives, the Icare PRO tonometer (IPT) provides a new type of portable reading using the principle of impact or rebound to measure IOP.The calculation is made by parametric variation of the motion after a magnetic probe reaches the cornea. Several studies have shown that IOP is higher in the supine position compared to measurements in the sitting position, so these changes have been associated with an increase in nocturnal IOP and could be related to the progression of glaucoma.[7, 10, 11, 21]
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