Background/aims: To compare the accuracy of A-scan biometry and magnetic resonance imaging for measuring axial length in silicone oil filled eyes.
Methods: Prospective randomized study included 70 patients. Biometry was performed using magnetic resonance imaging in 33 patients (MRI group) and A-scan echography in 37 patients (A-scan group). The difference between predicted and final refraction was measured and statistically evaluated.
Results: In patients with axial length ≥26 mm, mean deviation of the final from predicted refraction was −1.23 ± 0.67 D in the MRI group, and −2.3 ± 2.02 D in the A-scan group. The difference between those two groups was statistically significant (p=0.02). In patients with axial length <26 mm, mean deviation of the final from predicted refraction was −0.12 ± 1.29 D in the MRI group and −0.33 ± 1.39 D in the A-scan group. There was no statistical significance between those two groups (p=0.629).
Conclusion: For highly myopic patients MRI biometry presented more accurate measurement of axial length in silicone oil filled eyes. A-scan biometry and MRI biometry were comparably accurate in measuring axial length in patients with axial length <26 mm.
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