Intense pulsed light (IPL) is an ocular application derived from a procedure used in dermatology, primarily for the treatment of rosacea (couperose). Its use for dry eye dates back to 2009, when Dr. Rolando Toyos developed a specific protocol for this indication. IPL has several mechanisms of action, including anti-inflammatory and antimicrobial effects, and helps eliminate the abnormal blood vessels found in ocular rosacea, which can cause dry eye.