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N. G. Ghazi; Demonstration of Optic Nerve Head Pit Communication With the Vitreous Cavity and Orbit Using Spectral Domain Optical Coherence Tomography. Invest. Ophthalmol. Vis. Sci. 2010;51(13):4362.
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© ARVO (1962-2015); The Authors (2016-present)
To report a case of optic nerve head pit without associated maculopathy that demonstrated communications with both the vitreous cavity and the orbit on high-definition, spectral domain optical coherence tomography (HDSD-OCT) testing.
A 55 year-old male presented for evaluation of diabetic retinopathy. An optic nerve head pit was discovered in the left eye. No associated maculopathy was present. The optic nerve head was analyzed with HDSD-OCT imaging using a Spectralis Heidelberg unit.
The cross-sectional OCT images and the three dimensional constructs demonstrated a deep central excavation within the optic nerve. The excavation noted by OCT was much larger than the pit as noted clinically. The latter corresponded to a small defect located in a thick superficial membrane that was overhanging the pit cavity along the surface of the optic disc by OCT. Towards the most distal and lateral end of the pit cavity, a defect in the dural sheath of the optic nerve was noted by OCT allowing for communication between the pit and the orbit.
To our knowledge, this is the first demonstration of a communication of an optic nerve head pit with the orbit by HDSD-OCT. This finding suggests that orbital fluid may contribute to the maculopathy associated with an optic pit in some cases.
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