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COMPARISON OF ANTERIOR CHAMBER DEPTH (ACD) USING CONTACT ULTRASOUND A-SCAN AND CORNEAL TOPOGRAPHY
Rahaf Jarjous*, Taym Darwish and Najwa Kordoghli
Purpose: To compare the anterior chamber depth (ACD) using contact ultrasound A-scan and optical measurements (SIRIUS). Methods: 105 eyes of 55 patients were included in this study, ACD estimation was measured using contact ultrasound A-scan (AVISO) and then using corneal topography (SIRIUS). the Intra Ocular Lens (IOL) power was calculated using Haigis formula with anterior chamber depth measured by SIRIUS and AVISO and the results were compared. we also studied the correlation between central corneal thickness and the differences in ACD between the two devices was studied using Pearson Correlation. Results: Mean anterior chamber depth (ACD) using contact ultrasound A-scan and corneal topography (SIRIUS) was 3.3±0.3 and 3.6±0.3 respectively (p=0.0001). Mean IOL power (Haigis) using contact ultrasound A-scan and corneal topography (SIRIUS) was 22.01±3.3 and 21.3±3.3 respectively (p=0.01). negative correlation was found between central corneal thickness and the differences in ACD measurements. Conclusion: Contact ultrasound A-scan(AVISO) gives consistently lower measurements for ACD compared to corneal topography (SIRIUS) and Such a difference between the measurement systems also does not significantly affect the IOL power.[Full Text Article]