why do some people get red eye

By On this page: See also: When small, delicate blood vessels break beneath the tissue covering the white of the
( ), resulting may mean that you have a subconjunctival hemorrhage. A subconjunctival hemorrhage usually is benign, causing no vision problems or significant eye discomfort despite its conspicuous appearance. But eye redness also can be a sign of other types of potentially serious eye conditions. Particularly if you have, you should visit your for an to rule out an infection caused by bacteria, viruses or other microorganisms. (If you don't have an eye doctor, You should seek immediate care from an eye care professional whenever you experience unusual and persistent redness of the eye accompanied by a sudden change in vision, pain or strong light sensitivity.


This type of eye redness can be a sign of other eye problems such as sudden onset of. What Causes Subconjunctival Hemorrhages? Although it is not always possible to identify the source of the problem, some potential causes of subconjunctival hemorrhage include: A sudden increase in blood pressure that can result from heavy lifting, coughing, sneezing, laughing and constipation Rarely, a blood clotting disorder or vitamin K deficiency (vitamin K aids the functioning of proteins necessary for blood clotting) Eye surgery, including and How Are Subconjunctival Hemorrhages Treated? Lubricant artificial tears can soothe the eyes, although cannot help repair the broken blood vessels.


If you are taking aspirin or blood thinners, continue taking them unless your doctor specifically instructs you to do otherwise. Make sure not to rub your eye, which can increase the risk of re-bleeding right after onset similar to how a nose bleed is susceptible to re-bleeding in the early stages. How Long Do Subconjunctival Hemorrhages Last? In most cases, it takes seven to 10 days for a subconjunctival hemorrhage to resolve on its own. As the blood gradually disappears with time, the affected area can change color, like a bruise. Red eye occurs when the bright flash from the camera enters the eye and reflects off the retina back into the camera. I suppose one reason that some people are more susceptible is that they probably stare directly into the camera more.


Staring straight back increases the chance of red eye. The other reason would be related to the size and color of a person's iris, which controls how much light can get into the eye. (I wonder if blondes have more red eye? ) Cameras with red eye reduction turn the flash on early in order to cause the subjects iris to contract to reduce the amount of light getting in (and out) of the eye. Edit: After reading the comments, I looked further into the effect of eye color on causing red eye. It's not the color of the iris that has an effect, it's the amount of melanin in the eye. Melanin absorbs the red light, reducing the amount of red light reflected back to the camera.

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