This is often related to an autoimmune disorder, infection, or exposure to toxins. Uveitis - inflammation of the uvea, which includes the iris, ciliary body, and choroid. (The cornea is the outer covering of the eye.) Corneal ulcers - often caused by a bacterial or viral infection.If caused by an organism, this is highly contagious. It may be caused by a virus, bacteria, allergy, or irritation. This condition is often referred to as “pink eye”. Conjunctivitis - inflammation or infection of the membrane that lines the eyelids and coats the surface of the eye (the conjunctiva).Itching is common and your eyelids may appear greasy or crusty. Blepharitis - inflammation of the eyelash follicles along the eyelid.They cause redness as well as possible itching, discharge, pain, or vision problems: It generally clears up on its own within a week or two.Įye infections or inflammation can occur in different locations. If you notice a bloody blotch in one eye that doesn’t hurt, but just looks bad, don’t worry. Although this bloody area may appear alarming, it is a fairly common occurrence and of little significance. This is called a subconjunctival hemorrhage. This can lead to a bright red, uniformly dense bloody area on the sclera. One common cause of a red eye is straining or coughing. This may result from extremely dry air, sun exposure, dust, foreign body, an allergic reaction, infection, trauma, or other conditions. It is generally more important whether you also have eye pain or impaired vision.īloodshot eyes appear red because the vessels in the surface of the white portion of the eye (sclera) become enlarged and irritated. The degree of redness or appearance of blood usually does not correlate to how serious it is. Others are of no consequence or concern at all. Some are quite concerning, even medical emergencies. There are many possible causes of a red eye or eyes. Red eyes are caused by enlarged, dilated blood vessels leading to the appearance of redness on the surface of the eye. Bloodshot eyes Red eyes Eye redness Conjunctival injection.
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