Abstract

P 180

Immersion biometry and contact biometry compared to the IOL Master

Schröder A. C., Becker K., Seitz B.
Department of Ophthalmology, University of the Saarland, Homburg/Saar

Objective: Precise biometry is crucial for successful cataract surgery. Today, Zeiss IOL Master measurement is the golden standard procedure. But dense cataracts render limitations to this device and may require sonographic methods. Contact and immersion biometry are available. Both were compared clinically and tested against the IOL master.
Methods: Biometry was performed by an inexperienced examiner using contact biometry and immersion-biometry in 69 patients during pre-assessment for cataract surgery. In addition 15 patients were tested by an experienced examiner. Calculated IOL power for both devices was compared to the IOL-power proposed by the IOL Master.
Results: No significant IOL power differences for immersion measurements compared to IOL master were found. IOL power was 0.35 D (P=0.9) higher for the inexperienced observer, and 0.1 D (P=0.95) for the experienced observer. Contact biometric measurements showed significant differences for both examiners, error for the experienced observer (+1.96 D, P<0.01) being less than for the inexperienced (+1.7 D, P=0.02).
Conclusions: Immersion measurements provide a reliable and cost effective method of biometric assessment. Calculated IOL power is almost independent of observer’s experience and may be beneficial in cases of higher lens opacities.

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