2M.D. Professor, Ondokuzmayıs University, Faculty of Medicine, Department of Ophthalmology, Samsun/TURKEY Purpose: To compare the anterior chamber depth measurements (ACD) obtained by the Galilei Dual-Scheimpflug Analyzer (GSA) and conventional A-scan ultrasound in healthy subjects.
Materials and Methods: In this prospective study, ACD measurements of 80 eyes of 43 healthy subjects (30 adults and 13 children; 21 females and 22 males; mean age: 27.86±15.32 years) were respectively measured by GSA (Ziemer Group, Switzerland) and ultrasound. The data was analyzed statistically by the Paired-T test, Bland-Altman plot, and Pearson correlation test to assess the agreement of the measurements.
Results: The mean ACD values obtained by GSA and ultrasound were 3.58±0.29 mm and 3.47±0.33 mm, respectively. The mean difference between the ACD measurements obtained by ultrasound and GSA (GSA minus Ultrasound) was 0.11±0.14 mm and the difference between the ACD measurements of these devices was statistically significant (p<0.001). There was high correlation between the ACD measurements of GSA and those of ultrasound (r=0.90; p<0.001).
Conclusions: The ACD measurements of GSA and conventional A-scan ultrasound are highly correlated. GSA measures the ACD on average 0.11 mm longer than conventional ultrasound and this difference may be regarded as clinically insignificant.
Keywords : Anterior chamber depth, dual-Scheimpflug, ultrasound