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MRI biometry more accurately measures axial length in silicone oil-filled highly myopic eyes

Br J Ophthalmol. 2009;93(4):502-505.

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Eyes filled with silicone oil had more accurate axial length measurement results with MRI biometry than with A-scan echography when axial lengths measured 26 mm or more, a study found.

"In patients with axial length [of at least] 26 mm, the mean deviation of the final from predicted refraction was –1.23 D (SD 0.67) in the MRI group and –2.3 D (SD 2.02) in the A-scan group. The difference between these two groups was statistically significant (P = .02)," researchers said.

When examining patients with axial length less than 26 mm, however, the two measurement devices were "comparably accurate," clinicians said. The mean deviation of final from predicted refraction for patients with axial length less than 26 mm was –0.12 D (SD 1.29) in the MRI group and –0.33 D (SD 1.39) in the A-scan group, researchers said.

The prospective, randomized study examined 70 patients divided into two groups, one measuring MRI results (33 patients) and the other measuring A-scan results (37 patients).