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en.wikipedia.org/wiki/Red-eye_effect

The camera records this reflected light. The main cause of the red color is the ample amount of blood in the choroid which nourishes the ...

www.allaboutvision.com/resources/red-eye-photo.htm

The appearance of red eyes in pictures, known as the "red-eye effect," occurs when a camera captures light reflecting from the retina at the back of your subject's ...

www.yalescientific.org/2011/05/what-causes-the-red-eye-effect

May 12, 2011 ... The red-eye effect appears when flash photography is used at night ... of the eye's biology interacting with the camera's lighting mechanism.

www.photographymad.com/pages/view/the-red-eye-effect-what-it-is-avoiding-it-and-removing-it

Learn what causes it, how to prevent it, and how to fix it. ... The red eye effect is caused by your camera's flash bouncing off the back of the subject's eyes.

www.aao.org/eye-health/tips-prevention/diagnosing-children-from-photographs

Jul 28, 2014 ... A red reflex is produced when the flash of a camera lights up the ... the most serious eye conditions don't typically cause children pain or visual ...

www.thenakedscientists.com/articles/questions/what-causes-red-eye-photographs

Dec 6, 2009 ... Red eye occurs because when you take a flash photograph - the camera produces a big burst of light to illuminate the subject and that burst of ...

sciencenetlinks.com/science-news/science-updates/camera-red-eye

He says red-eye occurs when your camera's flash reflects off the back of the eye ... The purpose of this flash is to cause the subject's pupil to constrict (just as it ...

petapixel.com/2016/08/30/science-behind-red-eye-effect

Aug 30, 2016 ... Many cameras have a anti-red-eye mode that fires off quick flash bursts before the actual flash in order to cause the iris muscles to contract ...

cpn.canon-europe.com/content/education/infobank/flash/red-eye.do

However, the real cause of red-eye is the close proximity of the flash unit to the axis of the camera lens. You can eliminate red-eye completely by using the ...