In this episode, Optic Surgeon offers a concise guide on halos—rings of light around bright objects—for ophthalmology residents and final-year MBBS students. Through a case-based approach, we explore causes like corneal edema, cataracts, mucopurulent conjunctivitis, glaucoma, and post-surgical issues. We outline a systematic workup with history, slit lamp exam, and tests (e.g., topography, swab), plus tailored management, from antibiotics to urgent laser for angle closure.