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Does Optical Biometry Improve the Refractive Results in Cataract Surgery?
1Kutschan A., 1Böker K., 2Hager A., 3Wiegand W.,
1Klinikum Nord-Heidberg, Augenabteilung (Hamburg)
2 (Hamburg)
3Klinikum Nord Heidberg, Augenklinik (Hamburg)
Background: Optical biometry with the IOL-Master is an innovative technique which claims to improve the refractive results of cataract surgery compared to acoustical biometry.
Method: In 100 consecutive non-selected eyes prior to cataract surgery firstly an optical biometry (IOL-Master, Fa. Zeiss) and secondly an ultrasound biometry (Sonomed, SRK II-formula) were carried out. Cataract surgery was performed using two different types of PMMA-lenses with the respective A-constant. The IOL´s were always implanted in the capsular bag via a scleral tunnel. The length of the globe as well as the deviation between the postop refraction after 3 month and the preop desired refraction were compared.
Results: The mean length of the globe was 23.44±1.87 mm (min 20.44mm, max 31.81mm) in optical biometry and 23.28±1.83mm (min 20.33mm, max 30.12mm) in acoustical biometry. The deviation of postop refraction (spherical mean) from desired refraction was 1.03±0,86 D in optical biometry and 0,54±0,91 D in acoustical biometry. The differences in mean postop refraction of optical and acoustical biometry can be compensated by adaptation of the A-constants. The individual deviations between the postop refraction and the preop desired refraction were almost identical in optical and acoustical biometry.
Conclusion: Optical biometry represents a significant simplification in the course of investigation prior to cataract surgery. The claim of optical biometry, however, to gain a higher precision and thus a better prediction of individual postop refraction after cataract surgery is not yet fulfilled.