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Purpose: We report a case of chronic post-operative endophthalmitis secondary to Cutibacterium acnes (C. acnes) in a patient with an implantable collamer lens (ICL). Observations: A 45-year-old male presented three months after ICL implantation of the right eye with blurry vision, redness, and ocular pain in the setting of prolonged post-operative anterior chamber (AC) cell. Reduced visual acuity (VA) at 20/30-1, keratic precipitates, 1+ AC cell, and white ICL precipitates were concerning for chronic post-operative endophthalmitis. Anaerobic cultures from a vitreous tap grew C. acnes. Multiple intravitreal and intracameral injections with topical steroids were required to maintain a stable VA at 20/30; however, inflammation persisted and removal of the ICL and his native lens was ultimately required. Conclusions and importance: Chronic post-operative inflammation and white plaque after ICL implantation should raise high suspicion for endophthalmitis secondary to C. acnes. Anaerobic vitreous cultures can confirm the diagnosis. Removal of the ICL implant is often necessary for treatment. More research is needed to best manage this vision threatening condition.