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Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology 9/2012

01.09.2012 | Cataract

Comparison of intraocular lens power prediction using immersion ultrasound and optical biometry with and without formula optimization

verfasst von: Gabor Nemeth, Attila Nagy, Andras Berta, Laszlo Modis Jr

Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology | Ausgabe 9/2012

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Abstract

Purpose

Comparison of postoperative refraction results using ultrasound biometry with closed immersion shell and optical biometry.

Patients and method

Three hundred and sixty-four eyes of 306 patients (age: 70.6 ± 12.8 years) underwent cataract surgery where intraocular lenses calculated by SRK/T formula were implanted. In 159 cases immersion ultrasonic biometry, in 205 eyes optical biometry was used. Differences between predicted and actual postoperative refractions were calculated both prior to and after optimization with the SRK/T formula, after which we analysed the similar data in the case of Holladay, Haigis, and Hoffer-Q formulas. Mean absolute error (MAE) and the percentage rate of patients within ±0.5 and ±1.0 D difference in the predicted error were calculated with these four formulas.

Results

MAE was 0.5–0.7 D in cases of both methods with SRK/T, Holladay, and Hoffer-Q formula, but higher with Haigis formula. With no optimization, 60–65 % of the patients were under 0.5 D error in the immersion group (except for Haigis formula). Using the optical method, this value was slightly higher (62-67 %), however, in this case, Haigis formula also did not perform so well (45 %). Refraction results significantly improved with Holladay, Hoffer-Q, and Haigis formulas in both groups. The rate of patients under 0.5 D error increased to 65 % by the immersion technique, and up to 80 % by the optical one.

Conclusions

According to our results, optical biometry offers only slightly better outcomes compared to those of immersion shell with no optimized formulas. However, in case of new generation formulas with both methods, the optimization of IOL-constants give significantly better results.
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Metadaten
Titel
Comparison of intraocular lens power prediction using immersion ultrasound and optical biometry with and without formula optimization
verfasst von
Gabor Nemeth
Attila Nagy
Andras Berta
Laszlo Modis Jr
Publikationsdatum
01.09.2012
Verlag
Springer-Verlag
Erschienen in
Graefe's Archive for Clinical and Experimental Ophthalmology / Ausgabe 9/2012
Print ISSN: 0721-832X
Elektronische ISSN: 1435-702X
DOI
https://doi.org/10.1007/s00417-012-2013-9

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