A 69-year-old woman with bilateral primary open-angle glaucoma who underwent cataract extraction with intraocular lens implantation and excisional goniotomy with the Kahook Dual Blade (KDB; New World Medical, Rancho Cucamonga, CA, USA) in both eyes one year prior was referred for evaluation of significant visual acuity loss and pain in the left eye. On initial examination, intraocular pressure in the left eye was 3 mmHg and slit lamp examination revealed normal anterior chamber depth. Gonioscopy revealed a cyclodialysis cleft that was confirmed by anterior segment optical coherence tomography. Prominent chorioretinal folds suggestive of long-standing hypotony maculopathy were observed during fundoscopic examination. The cyclodialysis cleft, thought to be created inadvertently during the KDB goniotomy, resolved after three sessions of argon laser photocoagulation and the patient’s symptoms and visual acuity partially improved.