Quantification of the peripheral vitreous after vitreous shaving using intraoperative optical coherence tomography

OBJECTIVE: To evaluate the technique of peripheral vitreous shaving during vitrectomy, we measured the residual peripheral vitreous using intraoperative optical coherence tomography (iOCT). METHODS AND ANALYSIS: This retrospective study included 44 eyes that underwent 25-gauge pars plana vitrectomy with iOCT by a single surgeon. In all cases, the surgery was performed via ocular indentation. Cases in group A were treated with vitreous shaving under slit lamp microscope illumination, whereas cases in group B were treated with vitreous shaving under a wide-angle viewing system. Residual peripheral posterior vitreous-cortex detachment (PVD) was quantified by iOCT. RESULTS: iOCT image analysis enabled the visualisation of the angle formed between the retina and peripheral PVD around the vitreous base in all cases. After the completion of vitreous shaving, the mean length of the peripheral PVD was shorter in group A (961.7±214.7 µm) compared with group B (1925.3.7 ± 626.1 µm; p<0.01). CONCLUSION: iOCT enabled the quantification of the residual peripheral vitreous after vitreous shaving. The quantification of the residual peripheral vitreous after different shaving procedures will be important for advocating appropriate vitreous shaving in future.