Comprasion of ICare rebound tonometer and Goldmann applanation tonometer in high myopia.
OBJECTIVE
To compare intraocular pressure (IOP) measurements with the Goldmann applanation tonometer (GAT) and the ICare rebound tonometer (RBT) in high myopic eyes.


METHODS
This randomized prospective study included 40 eyes of 40 patients with high myopia. All patients' central corneal thickness (CCT), anterior chamber depth (ACD), axial length (AXL), keratometry, and refractive measurements were recorded and followed by IOP measurement with RBT and GAT.


RESULTS
The average CCT, AXL, and ACD were determined to be 514.65 ± 32 μm, 27.65 ± 2.22 mm, and 3.25 ± 0.51 mm, respectively. Mean K was 43.27 ± 1.4 D and mean spherical equivalent was -11.31 ± 4.30 D. The mean IOP values obtained by RBT and GAT were 17.18 ± 3.72 mmHg and 16.48 ± 3.19 mmHg, respectively. The deviations of RBT readings from corrected GAT values were highly correlated with CCT values (r = 0.588, P = 0.0001). The mean corrected GAT reading was 17.49 ± 3.01 mmHg. Linear regression analysis showed that a CCT change of 10 μm resulted in an RBT reading deviation of 0.57 mmHg. The Bland-Altman scatter-plot and McNemar test showed a clinically good level of agreement between the two tonometers.


CONCLUSIONS
This study found a good agreement level between the two tonometers in high myopic patients and that RBT measurements are influenced by CCT variations.
Department of Ophthalmology, Faculty of Medicine, Kafkas University, 36100 Kars, Turkey.
Halil Huseyin
HH
Cagatay
Department of Ophthalmology, Faculty of Medicine, Kafkas University, 36100 Kars, Turkey.
Metin
M
Ekinci
Department of Ophthalmology, Faculty of Medicine, Kafkas University, 36100 Kars, Turkey.
Zeliha
Z
Yazar
Department of Ophthalmology, Sarıkamış Military Hospital, 36520 Kars, Turkey.
Gokcen
0000-0001-9919-4893
G
Gokce
Department of Ophthalmology, Erzurum Training and Research Hospital, 34360 Erzurum, Turkey.
Erdinc
E
Ceylan
D000293:Adolescent; D000328:Adult; D000867:Anterior Chamber / Q000473:pathology; D058452:Axial Length, Eye / Q000473:pathology; D003315:Cornea / Q000473:pathology; D063171:Corneal Pachymetry; D005260:Female; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000175:diagnosis* / Q000473:pathology; D011446:Prospective Studies; D015203:Reproducibility of Results; D014065:Tonometry, Ocular / Q000295:instrumentation* / Q000379:methods