Purpose: To compare measurements of mean keratometry (K), axial length (AL), Jackson first and second astigmatism vector (J0 and J45), astigmatism magnitude, white-to-white (WTW) diameter and anterior chamber depth (ACD) values between two biometers, the Pentacam® AXL and the IOL Master 500.
Setting: Public hospital in Belgium.
Design: Retrospective instrument reliability analysis.
Methods: Eyes of cataract or refractive lens exchange patients were examined preoperatively on a device combining Scheimpflug imaging and partial coherence interferometry (Pentacam® AXL) and a reference optical biometer (IOL Master 500). K, AL, J0, J45, astigmatism, WTW and ACD values were compared.
Results: Three hundred and twenty-eight eyes of 187 cataract or refractive lens exchange patients (mean age 68years) were examined preoperatively. Measurements of mean keratometry, axial length, ACD, white-to-white and astigmatism were significantly different (P<0.05) between the two devices. Measurements of J0 and J45 did not significantly differ. Keratometry measurements with the Pentacam® AXL were significantly flatter than those measured with the IOL Master 500. Axial length measured with Pentacam® AXL was significantly greater when measured with the IOL Master 500, but this difference was not clinically relevant (0.015mm).
Conclusions: The Pentacam® AXL and the IOL Master 500 cannot be used interchangeably.
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