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Purpose: to compare optical biometer (IOL Master) and ultrasound biometry in emmetropic and myopic eyes as regards the measurements of axial length (AL), anterior chamber depth (ACD) and intraocular lens (IOL) power. Methods: Ocular biometry of cataract patients was measured by the ultrasound biometry (Sonomed PACSCAN 300A) and optical biometer (IOLMaster (Carl Zeiss Meditec, AG, Jena, Germany). Eyes with average axial length (AL22 -<26mm) were in group 1(177 eyes) and eyes with AL ≥26mm were in group 2 (75 eyes). Parameters compared were axial length (AL), anterior chamber depth (ACD), and IOL power using the SRK II formula in group1 and regression SRK-T formula in group2. Results: Two hundred and fifty two eyes of 252 cataract patients were evaluated with the two biometers. The mean values of the AL, ACD and IOL power differed slightly in both groups yet with strong correlation (Group 1: r = 0.995, 0.960, and 0.963, respectively; Group 2: r = 0.976, 0.960, and 0.970, respectively all p <0.001). The differences were significant in AL and IOL power (p ≤0.05). The IOL powers mean difference between the two devices was 0.52D in group 1 and 0.54D in group 2. Conclusion: The IOL Master biometer showed good correlation with ultrasound biometer; the gold standard device in ocular biometry.

COMPARISON OF OPTICAL AND ULTRASOUND BIOMETRY MEASUREMENTS IN EMMETROPIC AND MYOPIC EYES