Posters
Accuracy of the updated Hill-RBF intraocular lens power calculator for Japanese eyes with long axial lengths
Poster Details
First Author: Y.Mori JAPAN
Co Author(s): S. Tokuda K. Kinoshita K. Minami K. Miyata
Abstract Details
Purpose:
The Hill-RBF calculator was updated (ver.2.0) by utilizing the expanded database that consisted of eyes with very short and long axial lengths (ALs), so that the range of in-bounds calculations increased. In our knowledge, the improvement in the power calculation accuracy has not been evaluated. This retrospective study aimed to evaluate the accuracy of updated Hill-RBF calculator for Japanese eyes with long ALs.
Setting:
Miyata Eye Hospital, Miyazaki, Japan.
Methods:
Patients with an AL longer than 26.0mm who had uneventful cataract surgery with insertion of the ZCB00V (Johnson & Johnson Surgical Vision) were included in the retrospective study. With biometry data measured with optical low-coherence reflectometry (Lenstar LS900, Haag Streit), predicted postoperative refractions for implanted IOL were obtained in the use of the updated and old Hill-RBF calculators. Refractive errors from manifest refraction 1 month postoperatively were calculated and mean prediction error (ME), median absolute prediction error (MedAE) and percentage of eyes within ±0.5D and ±0.25D of errors were compared.
Results:
The study comprised 31 eyes of 24 patients. The range of AL was between 26.08 to 30.03 mm (mean: 27.43mm). The MEs of the updated and old Hill-RBF calculators were 0.17±0.30 D and 0.22±0.31D, respectively. The ME of the old Hill-RBF calculator was significantly more hyperopic than the use of the updated Hill-RBF calculator (P=0.0038). The MedAEs were 0.25D and 0.34D, respectively. The percentages within ±0.5D of errors were 87.1% in both calculations. There were 51.6% and 38.7% of eye within ±0.25D of errors, and the improvement with the use of the updated was found in 4 of 31 eyes.
Conclusions:
The updated Hill-RBF calculator was equally or more accurate for Japanese eyes with long ALs. The continuous updates might be increasing the accuracy.
Financial Disclosure:
None
