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A man in his 50s presented with floaters in his left eye. He had previously undergone cataract surgery with multifocal intraocular lens implantation (PanOptix, Alcon, Fort Worth, Texas, USA) in both eyes, followed by vitrectomy in the right eye for symptomatic floaters. There was no history of ocular trauma, uveitis or steroid use, and the cataract was considered to be age-related or idiopathic. Preoperative best-corrected visual acuity (BCVA) in the left eye was 20/20, and intraocular pressure (IOP) was 14 mm Hg. Slit-lamp biomicroscopy and anterior segment optical coherence tomography (AS-OCT) showed no abnormalities of the iris or anterior chamber angle. Preoperative angle assessment also revealed no abnormalities suggestive of angle narrowing or plateau iris configuration, and ultrasound biomicroscopy was not performed preoperatively. Fundus examination, including indirect ophthalmoscopy, showed no macular or retinal abnormalities; however, vitreous opacities with posterior vitreous detachment were observed. There were no signs of intraocular inflammation or vasculitis suggestive of uveitis. Because the patient continued to experience significant floaters and blurred vision attributable to vitreous opacities that interfered with daily activities, pars plana vitrectomy was performed in the left eye.