Posterior capsule opacification (PCO) is the most common cause of deterioration of vision and contrast sensitivity and glare after cataract surgery. Neodymium (Nd): yttrium aluminum garnet (YAG) laser capsulotomy is an effective and standard procedure to treat these symptoms. The incidence rate of PCO requiring Nd:YAG laser treatment varies and depends on published studies, ranging from 2.2% to 10.0%. Although Nd:YAG laser treatment is largely safe, it still has complications, such as transient increase of intraocular pressure, anterior uveitis, intraocular lenses pitting, cystoid macula edema, endophthalmitis, and retinal detachment. We encountered a rare complication related to Nd:YAG laser treatment, where the laser accidentally hits the cornea. This occurred because the PCO was mistaken for the corneal layers during the laser procedure. This report presents the 3-year post-treatment process, and the findings herein may help raise the awareness of the possibility of this rare complication and provide measures for its treatment.