Abstract Rohrer K et al.

Comparison and evaluation of ocular biometry using a new noncontact optical low-coherence reflectometer.

Rohrer K, Frueh BE, Wälti R, Clemetson IA, Tappeiner C, Goldblum D.
Ophthalmology. 2009 Nov;116(11):2087-92. Epub 2009 Sep 10.

PURPOSE:
To evaluate a new high-resolution noncontact biometer (Lenstar;Haag-Streit AG, Koeniz, Switzerland) using optical low-coherence reflectometryand to compare the clinical measurements with those obtained from the IOLMaster(Carl Zeiss, Jena, Germany) and the Pachmumeter (Haag-Streit AG).

DESIGN:
Exploratory evaluation of diagnostic technology and nonrandomized, prospectiveclinical trial.

PARTICIPANTS:
Eighty subjects (144 eyes) aged 20 to 90 years withcataractous, 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 degrees apart from R1]), and axis of the flattest radius (Ax1) obtained with the Lenstar were compared with those obtained with the IOLMaster orPachmumeter. The results were evaluated using Bland-Altman analyses. Thedifferences between both methods were assessed using the paired t test, and itscorrelation was evaluated by Pearson coefficient.

MAIN OUTCOME MEASURES:
Axiallength, CCT, ACD, R1, R2, and Ax1.

RESULTS:
The overall mean AL measured with theLenstar and the IOLMaster was 24.1 mm (r = 0.999). Anterior chamber depth was3.19 mm (Lenstar) and 3.17 mm (IOLMaster; r = 0.875). Excellent correlations alsowere 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 bothLenstar and Pachmumeter.

CONCLUSIONS:
Measurements with the new Lenstarcorrelated well with those with the IOLMaster and Pachmumeter 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.