13 doctors weighed in:
Why do my eyes turn red?
13 doctors weighed in

Dr. Steven Machtinger
Internal Medicine - Allergy & Immunology
6 doctors agree
In brief: Increased blood flow
Because the surface of the sclera (the white part of your eye) is thin & translucent it appears red when blood flow is increased.
Blood flow increases to the cornea with infection, irritation, or allergy. It also increases with autoimmune diseases affecting the eyes. Persistent redness of the eye, especially in the presence of pain or eye discharge, requires a doctor's prompt evaluation.

In brief: Increased blood flow
Because the surface of the sclera (the white part of your eye) is thin & translucent it appears red when blood flow is increased.
Blood flow increases to the cornea with infection, irritation, or allergy. It also increases with autoimmune diseases affecting the eyes. Persistent redness of the eye, especially in the presence of pain or eye discharge, requires a doctor's prompt evaluation.
Dr. Steven Machtinger
Dr. Steven Machtinger
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1 comment
Dr. David Sachs
The cornea is the clear window of the eye which has no blood vessels allowing us to see. I think that you are talking about the slcera or conjunctiva which is the white part of the eye that contains the blood vessels.
Dr. Paul M Bonds
Ophthalmology
3 doctors agree
In brief: Conunctival redness
The sclera is white.
It is never an other color (normally). The covering of the sclera is the conjunctiva which has vessels. It is these vessels that become dilated in inflammation or conjunctivitis. The cornea is avascular and gets oxygen from the air, tears, etc. If something is irritating the eye, the conjunctival vessels become dilated, and the eye will appear red. Depends on the cause!

In brief: Conunctival redness
The sclera is white.
It is never an other color (normally). The covering of the sclera is the conjunctiva which has vessels. It is these vessels that become dilated in inflammation or conjunctivitis. The cornea is avascular and gets oxygen from the air, tears, etc. If something is irritating the eye, the conjunctival vessels become dilated, and the eye will appear red. Depends on the cause!
Dr. Paul M Bonds
Dr. Paul M Bonds
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Dr. Payam Rafat
Podiatry
1 doctor agrees
In brief: Many possible causes
There are many causes of redness of the eyes.
Several types of inflammatory conditions, allergic reactions, detergents, chemicals, and sometimes bacterial, viral or fungal infections can cause redness of the eyes. Have it evaluated by a professional and get the appropriate treatment.

In brief: Many possible causes
There are many causes of redness of the eyes.
Several types of inflammatory conditions, allergic reactions, detergents, chemicals, and sometimes bacterial, viral or fungal infections can cause redness of the eyes. Have it evaluated by a professional and get the appropriate treatment.
Dr. Payam Rafat
Dr. Payam Rafat
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