Abstract Rabsilber TM et al.

Intraocular lens power calculation: clinical comparison of 2 optical biometrydevices.

Rabsilber TM, Jepsen C, Auffarth GU, Holzer MP.
J Cataract Refract Surg. 2010 Feb;36(2):230-4.

PURPOSE:
To evaluate intraocular lens (IOL) power calculation using a new opticallow-coherence reflectometry (OLCR) biometer and compare the results with thoseobtained with a partial coherence interferometry (PCI) optical biometer.

SETTING:
International Vision Correction Research Centre, Department of Ophthalmology,University of Heidelberg, Heidelberg, Germany.

METHODS:
Biometry measurements in eyes of cataract patients were performed by the same examiner with an OLCRbiometer (Lenstar LS 900/Allegro Biograph) and a PCI optical biometer(IOLMaster). After determination of axial length (AL), corneal radii values bykeratometry (R1 and R2), and anterior chamber depth (ACD), power calculation for an AcrySof MA60AC IOL was compared between the 2 devices using 4 formulas and thecorresponding IOL constants. The target was emmetropia.

RESULTS:
One hundred eyesof 100 cataract patients (mean age 70.0 years +/- 10.6 [SD]) were measured. Ofthe biometry parameters, the only statistically significant differences betweenthe 2 devices were in R2 (mean difference 0.02 +/- 0.05 mm), (R1 + R2)/2 (meandifference 0.01 +/- 0.04 mm), and ACD (mean difference 0.05 +/- 0.11 mm) (P<.01, Wilcoxon test). The mean differences in IOL power calculations using the 4formulas were not statistically significant between the 2 devices (P>.01,Wilcoxon test).

CONCLUSION:
The OLCR biometry device provided precise and validmeasurements and thus can be used for the preoperative examination of cataractpatients.