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The redeye effect occurs when light enters pupils which are mostly dilated (open), and the light is mostly parallel to the line-of-sight between the camera and the subject. The redness is caused by blood in the back of the eyes.

Redeye occurs more often in cameras where the flash is very close to the lens, because then the angle between the flash and the subject, and the lens and the subject, is very small, allowing almost all of the light to reflect back as redeye.

If the light shining on the eyes comes from a different angle than the camera's line-of-sight, such as from a remote flash, then the redeye effect is reduced.

If the pupils are closed by a bright flash prior to the picture being taken, then the redeye effect is reduced. Some cameras can do this redeye reduction pre-flash.

Redeye effects can be reduced or nearly eliminated in digital cameras with post-processing software, either on the camera or off of the camera.

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