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During clinical trials, the most frequent adverse events seen in patients treated with the Vitrasert (ganciclovir) Implant involved the eye.

During the first two months following implantation, visual acuity loss of 3 lines or more, vitreous hemorrhage, and retinal detachments occurred in approximately 10-20% of patients. Cataract formation/lens opacities, macular abnormalities, intraocular pressure spikes, optic disk/nerve changes, hyphemas and uveitis occurred in approximately 1-5%.

Adverse events with an incidence of less than 1% were: retinopathy, anterior chamber cell and flare, synechia, hemorrhage (other than vitreous), cotton wool spots, keratopathy, astigmatism, endophthalmitis, microangiopathy, sclerosis, choroiditis, chemosis, phthisis bulbi, angle closure glaucoma with anterior chamber shallowing, vitreous detachment, vitreous traction, hypotony, severe post-operative inflammation, retinal tear, retinal hole, corneal dellen, choroidal folds, pellet extrusion from scleral wound, and gliosis.