What causes yellow eyes in a photo subject? Is it the same as red-eye?
Both yellow and red eye are caused by the same effect: Light entering the eye is reflected off the retina and recolumnated by the eye’s lens. The factors that characterize this effect are the dialation (size of the opening) of the pupil, incident direction of the light, and the color of the retina. Usually, human’s retinas are red, but there can be a wide variation of this coloring. For example, albinos have virtually no pigment, which results in a bright red colored retina and increased red eye. Many animals have retinas that are of a different color that that of humans. Cats and dogs in particular can have a yellow or orange eye effect. There are several things that a photographer can do to reduce the red/yellow eye effect. Firing a flash several times before a picture is taken will cause the subject’s pupils to narrow, reducing the incident and reflected light from the eyes. This is sometimes automatically done by some cameras. Placing the flash at a different location than the came
