There are more reasons for redness of the eyes at noon, which may be the case of not getting rest after long-term eye use, dry eye or conjunctivitis caused by other reasons. The redness of the patient’s eyes is mainly caused by the congestion and expansion of the conjunctival blood vessels due to various reasons. If the patient does not get timely rest after a long period of work or study and reaches a state of fatigue at noon, the redness of the eyes will be manifested. When dry eye occurs in patients, due to abnormal tear secretion or kinetics leading to decreased stability of the tear film, decreased nutrition and moisturizing of the corneal epithelium and other functions, patients may experience dryness of the ocular surface, which manifests as bloodshot and red eyes. Due to allergies or infections and other causes of conjunctival inflammatory reaction, under the stimulation of inflammation, the patient can also be manifested as eye congestion, redness. Patients with significant eye congestion are advised to seek prompt medical attention to evaluate their condition and follow medical advice.