Is iCare rebound tonometry as accurate as Goldmann applanation tonometry in the measurement of intraocular pressure?

Sadiat Saka Eletu; Aliyu Hamza Balarabe; Kehinde Fasasi Monsudi; Ismail Lawal; Rumu Nallah Gero

Authors

Sadiat Saka Eletu Department of Ophthalmology, Federal Teaching Hospital, Birnin Kebbi, Kebbi State, Nigeria
Aliyu Hamza Balarabe Department of Ophthalmology, Federal Teaching Hospital, Birnin Kebbi, Kebbi State, Nigeria
Kehinde Fasasi Monsudi Department of Ophthalmology, Federal Teaching Hospital, Birnin Kebbi, Kebbi State, Nigeria
Ismail Lawal Department of Ophthalmology, Federal Teaching Hospital, Birnin Kebbi, Kebbi State, Nigeria
Rumu Nallah Gero Department of Ophthalmology, Federal Teaching Hospital, Birnin Kebbi, Kebbi State, Nigeria

Keywords:

Goldmann applanation, iCare rebound tonometer, intraocular pressure.

Abstract

Background: Intraocular pressure (IOP) measurement is an important examination in ophthalmic practice, especially in the diagnosis of optic nerve disease.

Aim: To compare intraocular pressure measurements obtained using the Goldmann applanation (GAT) tonometer with the iCare rebound tonometer (RBT) and evaluate the suitability of the iCare tonometer for routine clinical use.

Methods: A total of 410 eyes of 205 patients were studied. Using GAT measurements, patients were classified into three groups: Group A (7–15 mmHg), Group B (16–22 mmHg) and Group C (≥23 mmHg). The RBT measurements were compared with the GAT measurements using Student's paired t-test and Pearson's correlation. Statistical significance was set at p<0.05, while a difference of ±3 mmHg between the two instruments was considered clinically significant.

Results: There were 140 (34.2%) eyes in Group A, 206 (50.2%) eyes in Group B and 64 (15.6%) eyes in Group C. Overall, the mean difference in IOP values between GAT and RBT was 2.505±0.99 mmHg (p=0.096), while for Group C only, there was a statistically significant difference in the mean values of IOP obtained by GAT versus RBT (2.20±3.5 mmHg, p<0.01). There was a statistically significant correlation (r=0.84) between GAT and RBT measurements.

Conclusion: iCare significantly underestimated IOP at high IOP levels compared with GAT. Nevertheless, differences in the overall mean IOP values obtained by GAT and RBT were statistically insignificant. This suggests that the two instruments may be used interchangeably, but with caution in glaucoma patients when elevated IOP values are anticipated.

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