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KMID : 1191420120110010078
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Korean Journal of Optometry and Vision Science
2012 Volume.11 No. 1 p.78 ~ p.83
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Comparison of 3 Keratometers in Cataract Surgery
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Whang Woong-Joo
Joo Choun-Ki
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Abstract
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Purpose: To compare keratometric values obtained with a manual keratometer, the IOLMaster automated keratometer (Carl Zeiss), and the Pentacam rotating Scheimpflug camera (Oculus) in cataract surgery, and to characterize the refractive outcomes generated using each device.
Methods: In this retrospective study, 71 eyes of 71 patients were analyzed. The keratometric values obtained with different devices (manual keratometer, the IOLMaster automated keratometer and Pentacam scheimpflug camera) were employed for IOL power calculation. Axial length was measured by the IOLMaster partial coherence interferometry. The predicted refraction was evaluated using the SRK-T formula and optimization was conducted. Multiple comparisons of averaged corneal powers were conducted and the averaged corneal power was used to calculate the predicted refraction. The absolute values of corneal astigmatism were calculated using the corneal powers for the flat and steep meridians ([Ks-Kf]), and those were also compared. After cataract surgery, mean errors and mean absolute errors were compared.
Results: The mean keratometric values generated by manual keratometer, the IOLMaster automated keratometer, and the Pentacam Scheimpflug system (true net power) were 43.93±1.39, 44.02±1.40 and 42.93±1.43 diopter. The standard deviation of the mean errors from manual keratometer, IOLMaster optical biometer and Pentacam Scheimpflug system were 0.53D, 0.51D and 0.57D. The mean absolute values from manual keratometer, IOLMaster optical biometer and the Pentacam Scheimpflug system were 0.43±0.31, 0.42±0.29 and 0.47±0.33 diopter.
Conclusions: Corneal power measurements with the IOLMaster optical biometer are a good choice for application to cataract surgery.
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KEYWORD
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Biometry, Cataract extraction, Keratometry
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