MRI-Based Normative Measurement of the Ocular Globe Position in Relation to Inter-Zygomatic Line among Nepalese Subjects

Abstract

Introduction: Proptosis and enophthalmos are cardinal signs of many orbito-ocular and systemic diseases. The need for an imaging parameter that will aid its early detection is necessary, as visual compromise is a major consequence if they are not diagnosed and managed early. Methodology: This prospective study was performed in a tertiary center. Data were collected over the period of January to April 2021 with total of 300 normal ocular globes. The measurement was done at the level of lens (midglobe section) on T2-weighted axial image. Results: The distance between the anterior margin and inter zygomatic line of the right ocular globe was 16.95 ± 1.48 mm (ranged 14.2 - 20.5 mm) and that of left was 16.86 ± 1.38 mm (ranged 14.2 - 20.3 mm). The position of the globes showed no statistically significant differences among gender groups in our study and the position of the right globe within the orbit was significantly different from that of the left orbit. Conclusion: The position of the globes showed higher values in males than in female. However, a statistically significant difference in globe position was observed between right and left orbits. The distance between the posterior margin of the globe and the inter zygomatic line was found to be lower among the Nepalese population compared with other population.