2M.D. Associate Professor, Kayseri Training and Research Hospital, Eye Clinic, Kayseri/TURKEY
3M.D. Asistant, Kayseri Training and Research Hospital, Eye Clinic, Kayseri/TURKEY
4M.D. Asistant, Erciyes University Faculty of Medicine, Department of Biostatisitc, Kayseri/TURKEY ABSTRACT Purpose: To compare keratometry, astigmatism and axis values with different instruments in cataract patients and to assess the agreement and correlation between these devices.
Materials and Methods: 62 eyes of 62 cataracts patients (37 men, 25 women) with a mean age of 64±11 years (41-84) were included in the study. Keratometry, astigmatism, axis values of the patients were analysed with autokeratometer, IOL master and Pentacam and The difference, agreement and correlation between the devices were compared statistically.
Results: Keratometry values were 43.41±1.58 D (39.75-47.25D), 43.54±1.56 D (39.8-47.44 D), and 43.25±1.61 D (39.10-47.10 D), astigmatism values were 0.93±0.93 D (0-4.50 D), 1,10 ±1.08 D (0.23-5.57 D), 0.96±1.00D (0.10-4.40 D) and axis values were 78.250±61.760 (0-1800), 96.290±59.360 (5-1800), 86.220±56.170 (1.00-1750) for autokeratometer, IOL master and Pentacam, respectively. Keratometry and astigmatism values measured with these 3 devices showed good agreement, correlation and repeatability (interclass correlation coefficients for all the values above 0.90). However, the relationship in axial location values were found to be weaker (interclass correlation coefficients values below 0.90).
Conclusion: Keratometry and astigmatism measured with these three devices show good agreement, correlation and repeatbility. However, axis location values were weaker compared to other measurements. Therefore, the axis values measured with these devices should not be used interchangably.
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