Rev Bras Oftalmol.2026;85:e0094
Biometric accuracy in cataract surgery: a comparative study between the IOLMaster 500 and Argos
DOI: 10.37039/1982.8551.20260094
ABSTRACT
Purpose:
To assess the agreement between IOLMaster 500 and Argos for ocular biometry parameters
Methods:
This retrospective study included 104 patients (205 eyes) who underwent biometry with both devices. Measurements included axial length (AL), keratometry (K1, K2), and ACD. Anterior chamber depth (ACD) measurements were compared directly as reported by each device, without additional correction for corneal thickness.
Results:
No significant differences were found for AL (23.49 ± 1.29 mm versus 23.63 ± 1.35 mm; p = 0.737), K1 (43.36 ± 1.68 D versus 43.41 ± 1.61 D; p = 0.769), or K2 (44.28 ± 1.60 D versus 44.17 ± 1.58 D; p = 0.575). However, ACD values differed significantly (2.98 ± 0.41 mm versus 3.18 ± 0.36 mm; p = 0.009).
Conclusion:
IOLMaster 500 and Argos yield comparable AL and keratometry values, supporting their interchangeable use for these parameters. However, due to significant differences and bias in ACD, this parameter should be interpreted with caution and should not be considered directly interchangeable between devices. These results highlight the importance of consistent biometry protocols in IOL power calculation.
