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"Red eye ," an optical phenomenon in which a subject's eyes appear red in photographs taken with a flash unit, is a result of the flash light's directly illuminat- ing the retina . This happens when the subject looks straight into the camera on which a flash unit is mounted . The effect becomes more pronounced if there is little or no ambient light. In this case , the pupil of the eye is wide open, and the illuminated retina is clearly visible .
To avoid "red eye" you can take any or all of the follow - ing steps:
1.Brighten the room to minimize the opening of the subject's pupils.
2.Instruct the subject not to look straight into the camera .
3.Keep the flash unit as far away as possible from the camera by means of a sync cord .
Note that once "red eye" appears, there is no way of retouching the negatives.
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