Imaging features after radial optic neurotomy in cat eyes

Abstract

To evaluate the imaging features of cat optic disc after radial optic neurotomy (RON). A total of 10 healthy cats underwent RON unilaterally and examined by optical coherence tomography (OCT) and fundus fluorescein angiography (FFA) 1, 15, 30 and 90 days after the operation. One day after the operation, OCT showed that the depth of the incision reached the lamina cribrosa, with edema and thickening of the surrounding sensory retina. On the 15th day, the sensory retina edema and thickening were disappeared. On the 30th day, the depth of incision became shallow. Ninety days after the operation, the scar protruded from the lamina cribrosa. FFA examination showed that the incision appeared as hypofluorescence strip one day after the operation with retinal vessels leakage near the incision at vein phase. Incision was enlarged 15 to 30 days later, with hypofluorescence at early phase and partial staining at late phase. Ninety days after the operation, there was hypofluorescence at early phase and obvious scar staining at late phase. The imaging features of RON conform to a reparative process.