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¹M.D. Asistant Professor, Cumhuriyet University Faculty of Medicine Department of Ophthalmology, Sivas/TURKEY
²M.D., Cumhuriyet University Faculty of Medicine Department of Ophthalmology, Sivas/TURKEY
³M.D. Associate Professor, Cumhuriyet University Faculty of Medicine Department of Ophthalmology, Sivas/TURKEY
⁴M.D. Professor, Cumhuriyet University Faculty of Medicine Department of Ophthalmology, Sivas/TURKEY Purpose: To determine the agreement between the measurements of intraocular pressure (IOP) by two portable tonometers at patients with cornea pathology who were requiring contact lens usage.
Material and Methods: IOP measurements of 64 eyes without eye pathology except refraction error have been recorded before contact lens wearing and after 5 minutes with both devices. Tono-Pen XL measurements were done after 15 minutes following I-Care tonometer measurements. T test, Pearson correlation analysis and Blant&Altman analysis were used for statistical evaluation.
Results: Statistically significant difference were determined between measurements with and without contact lens (p<0.05). The results of measurements with I-Care were higher +2.07±3.38 mmHg than Tono-Pen XL and I-Care measurements with contact lens were higher +2.67±3.30 mmHg than Tono-Pen XL with contact lens (p<0.05). When we compare two device measurements separately; while there were no statistically significant difference between I-Care measurements with and without contact lens, Tono-Pen XL measurements showed statistically significant difference. Tono-Pen XL measurements with contact lens were lower 1.23±2.98 mmHg averagely than measurements without contact lens. While there was a good correlation between I-Care and Tono-Pen XL; I-Care and I-Care with contact lens and Tono-Pen XL and Tono-Pen XL with contact lens measurements (r=0.519, r=0.670, r=0.603 p<0.0001).
Conclusion: Although both devices can be used for IOP measurements with contact lens, I-Care tonometer can be preferred due to absent of significant difference between measurements with and without contact lens. Keywords : Contact lens, intra ocular pressure, tonometry