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en.wikipedia.org/wiki/Red-eye_effect

The red-eye effect in photography is the common appearance of red pupils in ... 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.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 ... that even the most serious eye conditions don't typically cause children pain ...

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 ...

www.quora.com/Why-do-some-people-have-red-eyes-in-pictures-and-some-do-not

It has to do with the flash reflecting off of the retina of the eye. When someone looks directly into ... When someone looks directly into a flash camera lens, it can reflect off the retina and . ... That is how 'Red Eye Reduction' works, the early burst of flashes causes everyone's pupils to constrict, so that when the final flash, which ...

www.todayifoundout.com/index.php/2011/09/what-causes-red-eyes-in-photographs

Sep 15, 2011 ... For instance, camera's with red eye reduction settings use a two flash system in which the first flash causes the pupil to constrict, and the ...

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

May 12, 2011 ... Your modified appearance is caused by the red-eye effect,… ... a result 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.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 ...

.ask.com/youtube?q=What+Causes+Red+Eye+in+a+Camera&v=KBk0LBMjmbI
Dec 30, 2014 ... How can a camera's flash make your eyes glow red? Tune in to learn how it works -- and how to prevent it. Learn more at HowStuffWorks.com: ...