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

Abstract：

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 Pachmumeter (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 degrees apart from R1]), and axis of the flattest radius (Ax1) obtained with the Lenstar were compared with those obtained with the IOLMaster or Pachmumeter. 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 Pachmumeter. CONCLUSIONS:Measurements with the new Lenstar correlated 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.

journal_name

Ophthalmology

journal_title

Ophthalmology

authors

Rohrer K,Frueh BE,Wälti R,Clemetson IA,Tappeiner C,Goldblum D

doi

10.1016/j.ophtha.2009.04.019

subject

Has Abstract

pub_date

2009-11-01 00:00:00

pages

2087-92

issue

11

eissn

0161-6420

issn

1549-4713

pii

S0161-6420(09)00372-8

journal_volume

116

pub_type

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