Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Enlarged optic nerve sheath imaged by ultrasound.
This first panel shows an ultrasound image of the optic nerve sheath, and surrounding structures. D1 denotes distance from the retina to the point of optic nerve sheath diameter measurement (3 mm). D2 denotes the measured optic nerve sheath diameter at 3 mm from the retina. In the second panel a corresponding image is shown labelling structures of the eye for direct comparison with the clinical image (first panel).
