A simple way to determine red eye is to make a diagnosis based on the patient’s signs and symptoms. Patients with red eye usually experience redness of the eyes, increased eye discharge, and tearing, and they usually have a recent cold or rubbing of the eyes that triggers the onset of red eye. In terms of physical signs, the doctor, through examination using a slit lamp microscope, can find that the patient’s capillaries in the conjunctival tissue are dilated and full, the lid conjunctiva on the inner surface of the eyelid has follicles, papillae, and other formations, and there is usually secretion formation in the conjunctival sac. If the patient has the above typical manifestations, it can be judged to have red eye disease. It is necessary to target the pathogenic microorganisms that cause red eye disease, and actively carry out drug treatment under the guidance of the doctor, and the commonly used drugs include levofloxacin hydrochloride eye drops, ganciclovir eye drops, and so on. If you suffer from red eye, you must go to the ophthalmology department of a regular hospital, and you should follow the doctor’s instructions on what drugs to use and how to use them.