Comparison and Evaluation of Ocular Biometry Using a New Noncontact Optical Low-Coherence Reflectometer
Received 23 October 2008; received in revised form 5 April 2009; accepted 7 April 2009. published online 10 September 2009.
Purpose
To evaluate a new high-resolution noncontact biometer (Lenstar; Haag-Streit AG, Koeniz, Switzerland) using optical low-coherence reflectometry and to compare the clinical measurements with those obtained from the IOLMaster (Carl Zeiss, Jena, Germany) and the Pachμmeter (Haag-Streit AG).
Design
Exploratory evaluation of diagnostic technology and nonrandomized, prospective clinical trial.
Participants
Eighty subjects (144 eyes) aged 20 to 90 years with cataractous, pseudophakic, aphakic, silicon oil–filled, or normal eyes.
Methods
Measurements of axial length (AL), anterior chamber depth (ACD), central corneal thickness (CCT), corneal radius (R1 [flattest radius of corneal curvature] and R2 [steep radius, 90° apart from R1]), and axis of the flattest radius (Ax1) obtained with the Lenstar were compared with those obtained with the IOLMaster or Pachμmeter. The results were evaluated using Bland-Altman analyses. The differences between both methods were assessed using the paired t test, and its correlation was evaluated by Pearson coefficient.
Main Outcome Measures
Axial length, CCT, ACD, R1, R2, and Ax1.
Results
The overall mean AL measured with the Lenstar and the IOLMaster was 24.1 mm (r = 0.999). Anterior chamber depth was 3.19 mm (Lenstar) and 3.17 mm (IOLMaster; r = 0.875). Excellent correlations also were found for the corneal radius and the axis of flattest radius (R1, r = 0.927; R2, r = 0.929; and Ax1, r = 0.938). Mean CCT was 0.557 mm (r = 0.978) for both Lenstar and Pachμmeter.
Conclusions
Measurements with the new Lenstar correlated well with those with the IOLMaster and Pachμmeter in cataractous, pseudophakic, aphakic, silicon oil–filled, and normal eyes. It is an accurate, fast instrument that provides additional information of interest to any cataract or refractive surgeon.
Financial Disclosure(s)
Proprietary or commercial disclosure may be found after the references.
Available online: September 10, 2009.
1Department of Ophthalmology, Inselspital, University Bern, Bern, Switzerland
3Department of Ophthalmology, University Hospital Basel, University Basel, Basel, Switzerland
Correspondence: David Goldblum, MD, Department of Ophthalmology, University Hospital Basel, University of Basel, CH-4031 Basel, Switzerland
Manuscript no. 2008-1254.
Financial Disclosure(s): The author(s) have made the following disclosure(s):
Supported by a grant from the Haag-Streit Foundation, Bern, Switzerland. The funding organization participated in the design of the study, data analysis, and review of the manuscript.
All authors had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Kaspar Rohrer - Financial Support - Haag-Streit.
Beatrice E. Frueh - Financial Support - Haag-Streit.
Isabelle Clemetson - Financial Support - Haag-Streit.
Rudolf Wälti - Employee - Haag-Streit Switzerland.
David Goldblum - Consultant - Haag-Streit Switzerland.
ABSTRACT