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


METHODS
Exploratory evaluation of diagnostic technology and nonrandomized, prospective clinical trial.


METHODS
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.


METHODS
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.
Rohrer
Kaspar
K
Department of Ophthalmology, Inselspital, University Bern, Bern, Switzerland.
Frueh
Beatrice E
BE
Wälti
Rudolf
R
Clemetson
Isabelle A
IA
Tappeiner
Christoph
C
Goldblum
David
D
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000473:pathology*; D001036:Aphakia, Postcataract / Q000473:pathology; D001699:Biometry / Q000295:instrumentation*; D002386:Cataract / Q000473:pathology; D003315:Cornea / Q000473:pathology*; D003941:Diagnostic Techniques, Ophthalmological; D005123:Eye / Q000473:pathology*; D005260:Female; D006801:Humans; D007368:Interferometry / Q000295:instrumentation; D008027:Light; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D019591:Pseudophakia / Q000473:pathology; D012827:Silicone Oils / Q000008:administration & dosage; D055815:Young Adult
D012827:Silicone Oils