Abstract

P 174

Partial coherence laser interferometry for optical biometry in eyes with heavy silicone oil endotamponades

Rössler G.¹, Huth J.¹, Alteheld N.¹, Dietlein T.², Walter P.^1
1Department of Opthalmology, Technical University Aachen; ²Department of Ophthalmology, University of Cologne

Objective: In some cases heavy silicone oil (HSO) is used as a new endotamponade after complicated vitreoretinal surgery. In former studies we showed that partial coherence laser interferometry (PCLI) gives good results of signal quality for the optical biometry in eyes filled with conventional silicone oil. Aim of our recent study was to show that optical biometry of HSO filled eyes leads to feasible results as well.
Methods: Ten consecutive eyes of 10 patients (mean age 61±11 yrs.) with HSO endotamponade were examined by using the Zeiss IOL-Master. As control group 10 eyes of 10 patients (mean age 67±11 yrs.) with conventional silicone oil filling were taken into account. In both groups axial length (AL) measurements and signal-to-noise ratios (SNR) of optical biometry were analyzed.
Results: Axial length measurements with signal-to-noise ratio > or =2 were taken into account. Mean AL in HSO filled eyes was 24.33±2.59 mm compared to 26.62±2.15 mm in the control group. The mean range between first and second AL measurement was 0.04±0.04 mm in the HSO group (control 0.04±0.03 mm), while mean SNR was 4.54±1.75 (control 6.61±2.19).
Conclusions: Even though higher SNR values could be achieved in eyes with conventional silicone oil filling, optical biometry gives feasible signal quality in eyes with HSO endotamponade as well.

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