ISSN: 2459-1777 | E-ISSN 2587-0394
Volume : 9 Issue : 2 Year : 2024
Agreement among Goldmann Applanation Tonometer, Easyton Transpalpebral Tonometer, Tonopen, and Icare in Patients with Keratoconus [Beyoglu Eye J]
Beyoglu Eye J. 2023; 8(3): 170-176 | DOI: 10.14744/bej.2023.56933

Agreement among Goldmann Applanation Tonometer, Easyton Transpalpebral Tonometer, Tonopen, and Icare in Patients with Keratoconus

Merve Beyza Yıldız1, Alev Özçelik köse1, Gokhan Celik2, Osman Kızılay2, Serhat Imamoglu1, Elvin Yıldız1
1Department of Ophthalmology, Haydarpasa Numune Training and Research Hospital, Istanbul, Türkiye
2Department of Ophthalmology, Zeynep Kamil Maternity and Children Hospital, Istanbul, Türkiye

OBJECTIVES: The objective of the study is to evaluate the agreement between Goldmann applanation tonometer (GAT) and Easyton transpalpebral tonometer, Tonopen, and Icare in patients with Keratoconus.
METHODS: This cross-sectional study included 46 eyes of 26 patients with keratoconus. Intraocular pressure (IOP) is measured using easyton, icare, tonopen, and GAT. Measurements were compared and the influences of corneal topographic variables on IOP measurement were evaluated. Bland–Altman plots were used for assessing agreement between different tonometers.
RESULTS: The mean age of the participants was 24.08±6.76 (range, 18–47) years (15 males and 11 females). The highest of the mean IOP values measured with different tonometers was obtained with Easyton (12.33±1.65), followed by Tonopen (11.59±2.17), GAT (10.67±1.52), and Icare (10.04±2.33). The mean IOP value measured with Easyton was significantly higher than that measured with GAT (p<0.001). There was no significant difference between GAT and either Tonopen (p=0.154) or Icare measurements (p=0.732). There was no significant difference between Tonopen and Easyton mea-surements (p=0.421). Icare measurements were correlated with central corneal thickness and keratometric values. GAT measurements were correlated with only Kmax. Thirty-eight (82.6%) of the differences were within the agreement limits (assumed clinically important deviation of up to ±2 mmHg) of GAT and Tonopen, 73.9% (n=34) were within the agree-ment limits of GAT and Icare, and 78.3% (n=36) were within the agreement limits of GAT and Easyton.
DISCUSSION AND CONCLUSION: Compared with GAT, the gold standard method, Easyton IOP readings were higher, while both Tonopen and Icare readings were similar to GAT. All three tonometers showed acceptable agreement with the GAT, however, Tonopen showed the greatest agreement.

Keywords: Easyton transpalpebral tonometer, goldmann applanation tonometer, icare, intraocular pressure, keratoconus, tonopen

Merve Beyza Yıldız, Alev Özçelik köse, Gokhan Celik, Osman Kızılay, Serhat Imamoglu, Elvin Yıldız. Agreement among Goldmann Applanation Tonometer, Easyton Transpalpebral Tonometer, Tonopen, and Icare in Patients with Keratoconus. Beyoglu Eye J. 2023; 8(3): 170-176

Corresponding Author: Merve Beyza Yıldız, Türkiye
Manuscript Language: English
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