The Axial Length Measurement On Mri And Iol Master 700 : A Comparative Study

To report comparative measurement of axial length on Magnetic Resonance Imaging (MRI) and IOL Master 700
To report variation in axial length measurement in different ocular and orbital conditions warranting MRI 

This study was a prospective observational study. Sixteen patients with different ocular and orbital conditions requiring MRI were included in the study. The study was approved by the institutional research board of the institute. Informed Patient consent was taken before enrolling in the study.

: Axial length of the eye was measured on T2 weighted axial MRI images from the anterior surface of the cornea to the retina-choroid complex posteriorly. Standard axial length was obtained using IOLMaster. Measurement by MRI were compared with IOLMaster 700 measurements.

We sought to assess agreement between MRI-derived data and the reference standard and ascertain whether the measures obtained from MRI can act as a proxy for axial length in studies where optical biometry is not performed.

In all of 16 eyes an MRI scan was obtained in the correct plane to measure the axial length. out of 16 eyes,10 patients were of optic neuritis, 3 patients were of non specific orbital inflammmatory disease and rest three patients were of Idiopathic intracranial hypertension.  The axial length measured by MRI and IOL master were comparable and difference was non significant.

Axial length measurements with MRI match reliably with axial lengths measured by optical biometry such as IOL Master 700.. Further refining the orbital MRI sequence
for the optimal ocular scan in specific conditions, and assessing these biometry measurements could potentially further minimize the error.