BACKGROUND:This study aims to evaluate the effectiveness of magnetic resonance imaging (MRI) in diagnosing and characterizing posterior segment eye lesions. The posterior segment, encompassing the vitreous, retina, choroid, and optic nerve, presents complex diagnostic challenges. MRI provides detailed soft tissue contrast and multiplanar imaging capabilities, offering advantages in assessing these structures. AIMS AND OBJECTIVES: 1.To study the role of Magnetic resonance imaging in lesions of posterior segment of eye, optic nerve and its sheath. 2. To characterize the lesionsinvolving posterior segment of eye with respect to location, intensity, enhancement characteristics, adjacent soft tissue changes and neural involvement MATERIALS AND METHODS:A prospective study was carried on 30 patients clinically suspected to have posterior segmental lesions.MRI of the orbit was performedin PHILIPS 1.5 tesla machine using T1 and T2 weighted sequences in multiple planes using quadrature coil. The orbits will be subsequently scanned using a high resolution small FOV sequence. RESULTS:In our study vitreous was the most common location involved followed by optic nerve complex. The most frequent pathology was vitreous haemorrhage followed by retinal detachment and posterior vitreous detachment. The most common intra-ocular tumor noted in paediatric population was retinoblastoma and in adult age group was choroid melanoma. Thus, high-resolution MR imaging allowed for precise localization of lesions, while signal intensity variations helped distinguish between different tissue types and pathological processes. CONCLUSION:MRI is a valuable tool in the evaluation of posterior segment eye lesions, providing detailed anatomical and pathological information. Its ability to differentiate tissue types and assess lesion extent makes it indispensable in the diagnosis and management of complex ocular conditions. This study supports the use of MRI as a primary imaging modality in cases where detailed assessment of the posterior segment is required.