Rupprecht M., Wirbelauer C., Häberle H., Pham D. T.

Abteilung für Augenheilkunde, Krankenhaus Neukölln, Berlin Rudower Str. 48; D-12351 Berlin

Objective: The estimation of the intraocular lens (IOL) power can be limited in patients with nanophthalmus or myopia. The purpose of this clinical study was to compare acoustic and optical biometry methods in these critical patient groups.
Methods: Prospectively 20 patients with an axial eye length (AL) <22,0 mm or >25,0 mm were studied with acoustic (Technomed and Storz) and optical (IOL-Master) biometry. Following standardized cataract surgery the calculated IOL (SRK II), the postoperative refraction (SE), and the difference from the target refraction (D) were compared.
Results: The mean AL values measured in patients with nanophthalmus were 21,42±0,54 mm (IOL-Master), 21,27±0,51 mm (Technomed) and 21,02±0,56 mm (Storz). In patients with myopia the average AL values were 25,74±0,79 mm, 25,71±0,56 mm and 25,26±0,77 mm, respectively. The mean calculated IOL was 27,5±1,70 D in patients with nanophthalmus and 16,4±1,03 D in myopic patients. The mean target refraction was [- 0,18±0,69 D] in the nanophthalmus group and -1,2±1,23 D in the myopic group. The calculated difference from the target refraction revealed mean values of -0,54±1,10 D and -0,20±1,39 D for acoustic methods, and values of 0,0±1,41 D for optical biometry.
Conclusions: Significant differences compared to the target refraction can occur in patients with an axial eye length below 22 mm or above 25 mm. The additional optical biometry seems to improve the correct IOL estimation.

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