2M.D., Numune Training and Research Hospital, Eye Clinic, Adana/TURKEY
3M.D. Asistant Professor, Cukurova University Faculty of Medicine, Department of Ophthalmology, Adana/TURKEY
4M.D., Cukurova University Faculty of Medicine, Department of Ophthalmology, Adana/TURKEY
5M.D., Ermenek State Hospital, Eye Clinic, Konya/TURKEY
6M.D., Antakya State Hospital, Eye Clinic, Hatay/TURKEY Purpose: This clinical study was conducted to compare intraocular pressure (IOP) measurements by Goldmann applanation tonometry (GAT), Rebound tonometry (Icare), Dynamic Contour tonometer (Pascal) and TonoPen XL (TP), to evaluate the effect of central corneal thickness (CCK) on IOP measurements.
Materials and Methods: The study included 39 healthy subjects. IOP measurements were taken using Icare, Pascal, TP and GAT, respectively. CCK was measured with ultrasound pachymetry. To compare the measurements; the analysis of percentage change and Pearson correlation, the average, median, standart deviation and minimum-maximum values were calculated. The agreement between 2 different devices was assessed by use of the Bland-Altman method.
Results: The average CCK was 528±16 μm (483-555 μm). The mean IOP, with Icare was 13.8±2.1 mmHg, with Pascal DCT was 14.0±2.2 mmHg, with TP was 14.0±3.4 mmHg, with GAT was 13.8±2.4 mmHg. There was no significant difference statistically between the IOP measurements of all methods (p>0.05). The percentage of the Icare, Pascal DCT and TP readings, which were all within ±3 mmHg of the GAT readings were respectively 66.6%, 61.5%, 56.4%. There was an agreement between corrected GAT values and the other tonometry values on the Bland-Altman graphs. There was no correlation between IOP measurements and CCT.
Conclusion: In our study, there was no significant difference between the four methods of IOP measurements. Icare tonometry does not require topical anesthesia, is easy to use, the measurement is fast. So, it can be used as a relevant tonometry in clinical setting.
Keywords : Icare, pascal tonometry, tonopen, goldman applanation tonometry, central corneal thickness