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Session Title: Special Cases
Session Date/Time: Monday 07/10/2013 | 17:00-18:30
Paper Time: 18:24
Venue: Elicium 1 (First Floor)
First Author: : P.Draschl AUSTRIA
Co Author(s): : N. Hirnschall A. Harrer J. Wiesinger M. Weber S. Maedel O.
Reproducibility of subjective refraction in pseudophakic eyes and the comparison with autorefraction and aberrometry measurements.
Vienna Institute for Research in Ocular Surgery, Department of Ophthalmology, Hanusch Hospital, Vienna
This prospective study included patients who underwent cataract surgery. Baseline measurements were performed at least 8 weeks after cataract surgery. Subjective refraction was performed using the Jackson cross cylinder method by two different observers, followed by five consecutive measurements with two different autorefractors (Topcon KR 8800, Japan and NIDEK Autorefractor ARK-560 A, Japan) and a Hartmann-Shack (HS) aberroemtry device (WASCA, Carl Zeiss Meditec AG, Germany). All measurements were repeated 1 week after baseline. Analysis was performed using the b-vector (blurring strength vector) which is a 3-dimensional vector that represents the sum of J0, J45 and M (=spherical equivalent).
In total, 100 pseudophakic eyes of 100 patients will be included. Preliminary results showed a mean b-vector for subjective refraction, autorefraction and HS measurements of 1.09D (1.12; 0.40 to 2.38), 1.55 D (1.51; 0.40 to 3.26) ad 1.22 D (1.35; 0.42 to 2.78) respectively. Reproducibility of autorefraction and HS measurements (mean of the standard deviations between all measurements for each patient) was 0.07 D (0.07) and 0.28 (0.30), respectively.
Deviation between different methods to assess manifest refraction can be considered as clinically relevant. The relatively poor reproducibility of refraction is a problem for optimizing constants for IOLs for power calculation.
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