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  Indian J Med Microbiol
 

Figure 1: (a) Normal, ONSD. (b) B-scan ultrasound picture showing a circular echolucent defect displayed just behind the globe indicating the cross section of the optic nerve. The diameter measured using callipers to obtain the retrobulbar optic nerve sheath diameter

Figure 1: (a) Normal, ONSD. (b) B-scan ultrasound picture showing a circular echolucent defect displayed just behind the globe indicating the cross section of the optic nerve. The diameter measured using callipers to obtain the retrobulbar optic nerve sheath diameter