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Hamid Hosseini, David Rivera, Gad Heilweil, Jean-Pierre Hubschman, Irena Tsui, Steven Schwartz; Enhanced depth optical coherence tomography imaging of the optic nerve canal in central retinal vein occlusion. Invest. Ophthalmol. Vis. Sci. 2013;54(15):1441.
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to assess if there is compression of the optic nerve canal creating a compartment syndrome in eyes with central retinal vein occlusion (CRVO).
The optic canal of eyes with unilateral CRVO were imaged with enhanced depth imaging (EDI) optical coherence tomography. A control group consisted of eyes without CRVO or optic nerve head pathology. EDI and color fundus photography centered on the optic nerve were aquired in both eyes of the CRVO group and one eye of the control group. Color optic nerve photograph was digitally overlaid over en face EDI images using retinal vessels as registration markers to determine the anatomical optic canal (Figure 1). The position of Bruch’s membrane compared to the edge of the optic canal on EDI was then determined at 12 clock hours around the optic canal.
Twenty patients with CRVO and 10 patients in the control group were included. In both eyes of patients with unilateral CRVO and in the control group Bruch’s membrane more commonly extended posterior to the optic canal nasally, indicating possible compression. There was no statistically significant difference in the position of Bruch’s membrane relative to the optic canal between CRVO eyes and control eyes at any of the 12 measured points.
No increased evidence of compression at the optic canal was observed in CRVO eyes when compared to fellow eyes or control eyes. This may explain the clinical observation that radial optic neurotomy for CRVO is ineffective.
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