[Ocular biometric measurements with a slit-lamp method (Orbscan)].
OBJECTIVE
To evaluate the accuracy and reproducibility of the biometric measurements obtained with the Orbscan((R)) device in normal eyes.


METHODS
Anterior chamber depth, axial length, and corneal diameter were studied in 50 normal eyes of 25 patients using the Orbscan((R)) device and A-Scan ultrasonography. For each eye, two exams were done successively and reproducibility was calculated by analyzing the difference between both measurements.


RESULTS
The reproducibility of anterior chamber depth and corneal diameter measurements obtained by Orbscan((R)) was high (respectively 0.721.25% and 0.831.40%). The anterior chamber depth measurements by Orbscan((R)) and A-Scan ultrasonography were strongly correlated (rs=0.92;p<0.001). The axial length measurement obtained with the Orbscan((R)) device was less reproducible (3.554.11%). For the axial length, the Orbscan((R)) measurements and A-Scan ultrasonography measurement was poorly correlated. (rs=0.64; p<0.001).


CONCLUSIONS
The anterior chamber depth measurement obtained with the Orbscan((R)) device showed high reproducibility and it was strongly correlated with the measurement obtained by A-Scan ultrasonography. Axial length measurement obtained with the Orbscan((R)) device was less reproducible and poorly correlated with the A-Scan ultrasonography measurement. It was not relevant for clinical application.
Allouch
C
C
Pôle Saint Antoine/CHNO des Quinze-Vingts, 28, rue de Charenton, 75571 Paris Cedex 12, France.
Touzeau
O
O
Borderie
V
V
Puech
M
M
Scheer
S
S
Laroche
L
L
D000328:Adult; D000867:Anterior Chamber / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D009885:Ophthalmology / Q000295:instrumentation / Q000379:methods; D011446:Prospective Studies; D015203:Reproducibility of Results; D014463:Ultrasonography