Comparison of the incidence of postoperative ocular hypertension after pars plana vitrectomy and phacoemulsification and aspiration in dogs.

PPV carries lower POH risk than PEA but requires postoperative IOP monitoring.

This retrospective study compared the incidence of postoperative ocular hypertension (POH) following pars plana vitrectomy (PPV) and phacoemulsification and aspiration (PEA) in dogs. Medical records from 377 eyes (300 dogs) between January 2018 and December 2021 were analyzed across three groups: PPV-only (43 eyes), PEA+PPV combined (48 eyes), and PEA alone (286 eyes). Intraocular pressure was measured preoperatively and at multiple timepoints up to 48 hours postoperatively using rebound tonometry. Results demonstrated POH incidence of 9.9% in the PPV group (2.3% PPV-only, 16.7% PEA+PPV) versus 25.5% in the PEA group. The PPV group showed significantly lower POH incidence compared to PEA. The findings indicate that while POH can occur after PPV for rhegmatogenous retinal detachment, the risk is substantially lower than after PEA. The authors recommend postoperative intraocular pressure monitoring following PPV due to POH development risk, similar to PEA protocols.

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