·A 20-year-old healthy lady was admitted for septic arthritis in the right knee.Two weeks after the onset of joint pain,she complained progressive blurring of vision in both eyes.Slit-lamp examination revealed evidence of inflammation in both anterior and posterior segments.There were multiple chorioretinal lesions on both fundi.Synovial fluid aspiration of the right knee and blood culture grew Staphylococcus aureus.She responded well to topical and systemic antibiotics.Her final visual acuity was 6/6 in both eyes.This case illustrates a rare presentation of bilateral endogenous endophthalmitis in an immunocompetent young patient presenting with a concurrent septic arthritis.Early diagnosis and a prompt management carry a favorable visual prognosis.·