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Comparison of intraocular lens decentration and tilt measurements using 2 Purkinje meter systems


Purpose: To evaluate the difference in intraocular lens tilt and decentration measurements with 2 Purkinje meters.

Setting: Vienna Institute for Research in Ocular Surgery, Hanusch Hospital, Vienna, Austria.

Design: Prospective evaluation of diagnostic test.

Methods: This single-center study included pseudophakic patients in 2 substudies inwhich 3 consecutivemeasurements were performed with 2 Purkinje meters (Spanish and German). In substudy 1, an inexperienced examiner performed all measurements after a short learning period. In substudy 2, all measurements were taken by experienced examiners under direct supervision of the inventors of the devices.

Results: Substudy 1 included 53 pseudophakic eyes in which all 53 scans were successful with the Spanish device; however, only 35 measurements (66%) were successful with the German Purkinje meter. The mean tilt measured with the Spanish Purkinje meter was 4.35 degrees G 2.50 (SD) and 9.20 G 6.96 degrees with the German Purkinje meter. The mean decentration was 0.44 G 0.19 mm and 0.74 G 0.91 mm, (P Z .44), respectively. In substudy 2 (29 pseudophakic eyes), the number of successful scans was 29 (100%) and 18 (62%) for the Spanish meter and German Purkinje meter, respectively. The mean horizontal and vertical tilt difference vector between the 2 systems was 4.89 G 3.24 degrees and 7.57 G 3.82 degrees, respectively.

Conclusions: Concerning clinical feasibility, the Spanish Purkinje meter had a greater percentage of successful scans than the German device. In addition, this device measured significantly higher tilt values than the Spanish Purkinje meter.

J Cataract Refract Surg 2017; 43:648–655 Q 2017 ASCRS and ESCRS


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