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High resolution ocular B-scan ultrasonography is a new tool in the quest for better diagnostic aids in the study of ocular lesion. The present study evaluates its usefulness to study various posterior segment lesions of the eye when direct ophthalmoscopy is not possible in presence of opaque media due to various causes and correlate it with the clinical findings and other investigations. Material and methods: A prospective study was carried on 91 patients clinically suspected to have posterior segmental lesions in the presence of opaque media. Ocular ultrasonography was performed in all patients by contact method. In all cases clinical and ocular sonography diagnosis were correlated with final diagnosis to infer the accuracy. Results: In our study trauma and infective / inflammatory etiologies accounted for most of the ocular pathologies. Vitreous (52.9%) was the most common layer involved followed by retina and choroidal layers. Vitreous hemorrhage (31%) was the most common vitreal abnormality and retinal detachment was most common retinal abnormality. The overall diagnostic accuracy of high resolution ocular sonography for evaluation posterior segment ocular pathologies was 98.6%. Conclusion: Ocular ultrasonography provides nonionizing, cost effective, noninvasive technique to evaluate congenital, developmental ocular anomalies, ocular tumours and trauma. B-mode ultrasonography of eye is a vital part of an ophthalmologist's diagnostic armamentarium especially with cases of opaque ocular media.

Role of High Resolution Sonography (B-SCAN) in the Evaluation of Posterior Segment Lesions of Eye