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Published on: July 24, 2020
Accuracy of Axial Length Measurements by Two Swept-Source Optical Coherence Tomography Biometers in Macula-off
Hany Ahmed Helaly1, Osama Ramadan Elnaggar1, Mohsen Abou Shousha1
1Ophthalmology Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt.
Purpose:
To assess the accuracy of axial length (AXL) measurements using two swept-source optical coherence biometers, IOLMaster 700 (Carl Zeiss Meditec AG, Jena, Germany) and ARGOS (Alcon, Inc. Fort Worth, TX), for macula-off rhegmatogenous retinal detachment (RRD).
Methods:
This retrospective study included 100 eyes with phakic primary macula-off RRD. Preoperative AXL measurements were performed using different methods: applanation A-scan ultrasound (U/S) biometry, combined applanation vector A/B-scan biometry, and optical biometry measurements were obtained using IOLMaster 700 (Carl Zeiss, Meditec, Jena, Germany) and ARGOS (Alcon, Inc. Fort Worth, TX). All patients underwent pars plana phacovitrectomy. At 8-10 weeks postoperatively, optical biometry was performed to record AXL.
Results:
Mean preoperative AXL measured using vector-A/B-scan ultrasonography was higher than that of postoperative AXL measured using IOLMaster (p < 0.05). Mean AXL measured by the standard mode of the ARGOS optical biometer was lower than mean AXL measured by both enhanced retina visualization (ERV) mode and user-adjusted method (p < 0.05). Mean same-eye AXL measured using IOLMaster was lower than that measured using ARGOS (p < 0.05). The least difference was observed with combined vector-A/B-scan ultrasound (on the positive side), followed by fellow eye AXL measured using IOLMaster optical biometry (on the negative side).
Conclusion:
Optical biometry of fellow eye in macula-off RRD was noted to be highly correlating with postoperative optical biometry of same eye using IOL Master 700 in eyes without anisometropia. IOLMaster 700 showed less accuracy in the AXL measurements for same eye. The ARGOS optical biometer may have a good potential for measuring same eye AXL. Using ERV mode or a user-adjusted method for the ARGOS optical biometer may improve accuracy of AXL measurements. Most accurate method for measuring AXL in same eye was vector-A/B-scan ultrasound.
