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Eye redness is caused by swollen or dilated blood vessels, which cause the surface of the eye to look red, or bloodshot.
There are many possible causes of a red eye or eyes. Some are a cause for concern. Others are of no consequence or concern at all. The degree of redness usually does not correlate to how serious the situation is. It is generally more important whether you also have eye pain or impaired vision.


  • Bloodshot eyes appear red because the vessels in the surface of the white portion of the eye (sclera) become enlarged and irritated. This may result from extremely dry air, exposure to the sun, dust, foreign bodies, an allergic reaction, infection, trauma, or other conditions.
  • One common cause of a red eye is straining or coughing. This can lead to a bright red, uniformly dense bloody area on the white of the eye. Although this bloody area may appear alarming, it is a fairly common occurrence and of little significance. If you notice a bloody blotch in one eye that doesn't hurt, but just looks bad, don't worry. It generally clears up on its own within a week or two.
  • Eye infections or inflammation can occur in different locations. They cause redness as well as possible itching, discharge, pain, or vision problems.
  • Blepharitis -- inflammation of the eyelash follicles along the eyelid. It is caused by skin bacteria. Itching is common, and your eyelids may appear greasy or crusty.
  • Conjunctivitis -- inflammation or infection of the membrane that lines the eyelids and coats the surface of the eye (the conjunctiva). This condition is often referred to as "pink eye." It may be caused by a virus, bacteria, allergy, or irritation. If caused by an organism, this is highly contagious.
  • Corneal ulcers -- ulcers that appear on the outer covering of the eye, usually because of a bacterial or viral infection.
  • Uveitis -- inflammation of the uvea, which includes the iris, ciliary body, and choroid. This is often related to an autoimmune disorder, infection, or exposure to toxins. Often, only the iris is inflamed, which is called iritis.

Other potential causes include:

  • Cold or allergies.
  • Foreign objects in the eye that cut or damage the eye. See: Eye emergencies
  • Acute glaucoma -- a sudden increase in eye pressure that is extremely painful and causes serious visual disturbances. This is a medical emergency. Most times, glaucoma is chronic and gradual.
  • Corneal scratches caused by sand, dust, or overuse of contacts.
  • Bleeding problems (for example, from excess use of blood thinning drugs).

Home Care: For fatigue or eyestrain, try to rest your eyes. No treatment is necessary.

If you have conjunctivitis

  • Avoid touching the infected eye.
  • Apply cool or warm compresses throughout the day.
  • Do not use eye makeup or wear contact lenses until the infection has cleared. Throw away items like these that you used in your infected eye.
  • Wash your hands frequently.

If you have blepharitis

  • Apply warm compresses to your eyes for 5 minutes. Do this at least two times per day.
  • Using a cotton swab, gently rub a solution of warm water and no-tears baby shampoo along your eyelid, where the lash meets the lid. Do this in the morning and before you go to bed.

To prevent conjunctivitis

  • Do NOT share anything that has touched the eye of someone with this contagious condition -- like pillowcases, sheets, towels, or eyeliner. Wash your hands right away if you have come in contact with someone with conjunctivitis.
  • Wash out any chemicals or objects from your eye immediately

Homeopathic Approach

Homeopathy is famous for having wonderful medicines for conjunctivitis. We not only cure conjunctivitis which is seasonal and which is easily contagious but we also have very good cure for redness of the eyes which affects numerous people due to allergy. We also use a preventive for conjunctivitis.