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

Document Type : Original articles: include clinical trials, interventional research, Basic researches and clinically relevant laboratory investigations

Authors

Ophthalmology dept., Faculty of Medicine, Sohag Univ., Sohag, Egypt

Abstract

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.

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