Redness of the patient’s eyes when it is hot may be due to factors such as infectious conjunctivitis and eye allergies. When it is hot, there is a possibility that sweat etc. may run into the eye causing contamination of the eye, which leads to an increased chance of developing infectious conjunctivitis. The occurrence of infectious conjunctivitis is mainly caused by pathogenic microorganisms infecting the conjunctival tissues of the eye. Patients can use antibiotic eye drops as prescribed by the doctor, such as levofloxacin eye drops and tobramycin eye drops, to control the severity and alleviate the discomfort of the eye. When it is hot, the air is usually easy to have pollen, willow floss, poplar floss and other allergens floating in the air, allergic patients can lead to allergic reactions after contact with allergens, patients with itchy eyes, conjunctival congestion, so that the patient’s eyes redness, the patient can comply with the doctor’s instructions to use anti-allergy eye drops treatment, such as olopatadine hydrochloride drops, azlocisteine hydrochloride drops, and so on. It is recommended that patients with obvious redness of the eyes should consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for treatment.