Why is the cat's eye exposed?

Red eye is a common phenomenon in photography. Red eye is caused by the light from the camera flash reflecting from the back of the eye (retina) of the subject and entering the camera lens. Because the retina is covered with blood vessels and appears red, the eyes of the subject in the final image are "red". Red-eye phenomenon does not mean that there is anything wrong with the subject's eyes.

To reduce red eye, try the following techniques:

/question/48024033.html？ si=3