Cataract patients with white foreign matter in the eye after surgical treatment may be caused by secretion or drug sediment in the eye. Cataract is a common disease in ophthalmology, which occurs in middle-aged and elderly people, usually caused by ageing, ultraviolet radiation and other factors that lead to clouding of the lens inside the eye, patients may have symptoms of vision loss, and usually need to be treated by surgery. Patients need to continue to order eye drops in the eye after surgery to promote recovery, such as tobramycin dexamethasone eye drops. After the drops are absorbed in the eye, some of the drug residue may remain in the conjunctival sac, resulting in a white foreign body in the eye, which is generally not harmful to health. If the patient does not pay attention to eye hygiene after surgery, causing inflammation such as conjunctivitis, resulting in increased eye secretions, may also cause white foreign matter in the eye. Antibiotic eye drops, such as levofloxacin eye drops, can be ordered for treatment. All of the above medications should be used in accordance with medical advice. It is recommended that patients go to the ophthalmology department of the hospital in a timely manner, so that the doctor can identify the cause and take targeted treatment.