If your eyes are still red 4 months after strabismus surgery, you can consider conjunctivitis and keratitis caused by bacterial infection. Eye inflammation will cause conjunctival congestion, so there will be red eyes. The recovery period after strabismus surgery is 1~3 months, up to 4 months, the eyes still appear red, mainly due to local eye infections caused by, such as conjunctivitis, keratitis and so on. Patients with eye infections can use medication under doctor’s guidance, such as tobramycin eye drops and levofloxacin eye drops, to control inflammation and promote recovery. It is recommended that patients after strabismus surgery follow the doctor’s instructions for care, regular checkups, and timely consultation when discomfort occurs.