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Comparison of intraocular lens decentration and tilt measurements using 2 Purkinje meter systems
Sophie Maedel1, Nino Hirnschall1, Natascha Bayer1
1From the Vienna Institute for Research in Ocular Surgery (Maedel, Hirnschall, Markovic, Findl), A Karl Landsteiner Institute, Hanusch Hospital, and Laser and Optics in Applied Life Sciences (Bayer), University of Applied Sciences Technikum Wien, Vienna, Austria; Laboratorio de Óptica (Tabernero, Artal), Departamento de Física, Universidad de Murcia, Murcia, Spain; Vision & Eye Research Unit (Tabernero), Postgraduate Medical Institute, Anglia Ruskin University, Cambridge, and Moorfields Eye Hospital NHS Foundation Trust (Findl), London, United Kingdom; the Section of Neurobiology of the Eye (Schaeffel), Institute for Ophthalmic Research, Tübingen, Germany.
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 in which 3 consecutive measurements 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 ± 2.50 (SD) and 9.20 ± 6.96 degrees with the German Purkinje meter. The mean decentration was 0.44 ± 0.19 mm and 0.74 ± 0.91 mm, (P = .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 ± 3.24 degrees and 7.57 ± 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.
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