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First Author: R.Amar FRANCE
Co Author(s): C. Albou-Ganem D. Lebuisson
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Evaluation of the measurement accuracy using a new optical biometer AL-Scan (Nidek) and comparison according to the IOL Master V.5 (Carl Zeiss Meditec) device.
Clinique de la Vision, Paris, France.
In a prospective clinical study biometric measurements along with intra-ocular lens power calculation using the AL-Scan device were performed. 25 eyes of 13 patients were included in the study. Measurements were repeated using the IOL Master V.5 device. Results were elaborated using Pearson"s correlation for Axial length (AL), mean keratometry (Km), Anterior Chamber Distance (ACD) and IOL calculation (118, SRKT formula).
Mean values and ranges of axial length results were as follows: 24.15 +/- 1.66 mm [21.41-26.98] for IOL Master, and 24.18 +/- 1,64 mm [21.42-26.96] for AL-Scan. Mean values of keratometry were 44.22 +/- 1.77 D [41.51-47.58] for IOL Master and 44.17 +/- 1,79 D [41.51-47.40] for AL-Scan (2.4 mm diameter), 44.16 +/- 1,79 D [41.51-47.47] for AL-Scan (3.3 mm diameter). Mean values and ranges of ACD results were as follows: 3.50 +/- 0,57 mm [2.24-4.42] for IOL-Matser and 3.53 +/- 0,56 mm [2.48-4.39] for AL-Scan. Pearsons correlation evaluation between results of IOL Master and AL-Scan were respectively: 0.996 for mean axial length; 0.996 for mean keratometry (with 2.4 mm diameter AL-Scan measurements), 0.993 for mean keratometry (with 3.3 mm diameter AL-Scan measurements); and 0.999 for IOL calculation (SRK T, A const 118).
The AL-Scan device enables to perform accurate and repetitive biometric measurements and intra-ocular lens (IOL) power calculations. IOL calculation results obtained using the AL-Scan device are comparable to those achieved using the IOL Master V.5 device.