There are many reasons for the redness of patients’ eyes, mainly including acute conjunctivitis, inverted eyelashes, visual fatigue, glaucoma, ocular trauma and so on. 1. Acute conjunctivitis: If patients rub their eyes with their hands, bacteria or other pathogens enter the eyes, causing inflammation of the conjunctiva. Under the stimulation of inflammation, the patient may have conjunctival congestion, so the patient may have red eyes, the patient may also have increased ocular discharge, photophobia, tearing discomfort. 2. Inverted eyelashes: Inverted eyelashes can lead to conjunctival congestion because the eyelashes are inverted to the eyeballs, which irritates the eyeballs and leads to conjunctival congestion, and the patients can have the performance of redness of the eyes. 3. Visual fatigue: If the patient plays the cell phone or reads books for a long time, the eyes do not get rest, and visual fatigue occurs, the conjunctiva can also be congested, resulting in redness of the eyes, and there will also be soreness and dryness of the eyes and other uncomfortable symptoms. 4. Others: In addition, acute attacks of glaucoma, eye trauma, etc., can also lead to conjunctival congestion, red eyes. It is recommended that patients with obvious eye congestion should consult a doctor promptly to assess their condition and follow the doctor’s instructions for treatment.