Redness in the whites of the eyes is a very common clinical phenomenon and can be caused by a variety of reasons. It can be caused by a number of ocular diseases, such as subconjunctival hemorrhage, conjunctivitis, keratitis, sclerositis, iridocyclitis, glaucoma, etc. Traumatic injuries to the eye can also be caused, such as contusions, penetrating injuries, rupture injuries, and blast injuries. Postoperative reactions to eye surgery can also be caused, such as after cataract surgery, glaucoma surgery, pterygium surgery, and after surgery for some fundus diseases. Redness in the white of the eye caused by inflammation is mainly due to congestion in the eye and is caused by bacteria, viruses, fungi, and allergic factors. Redness in the white of the eye caused by trauma or post-operative eye surgery is mainly due to bleeding in the eye, which is caused by rupture of small blood vessels under the bulbar conjunctiva due to trauma or surgery. In addition to the above causes, there are also some causes of redness in the whites of the eyes caused by excessive fatigue, frequent late nights, frequent consumption of spicy and irritating foods and smoking and drinking. Therefore, there are many causes of redness in the whites of the eyes, including inflammation, trauma and some spontaneous causes, which can be caused by different causes and different manifestations.