Question

would your pupillary reflex get faster if you repeatedly shine a flash light to your eye?

Answer 1

The size of your pupils actually reflects the state of your body and mind. Pupil size can change because you are fearful, angry, in pain, in love, or under the influence of drugs. Not only does the pupil react to emotional stimuli; it is itself an emotional stimulus. The size of a person's pupils can give another person a strong impression of sympathy or hostility.

The response of the pupil is an involuntary reflex. Like the kneejerk reflex, the pupillary response is used to test the functions of people who might be ill or injured.

The pupil of your eye is also the source of the red eyes you sometimes see in flash photographs. When the bright light of a camera flash shines directly through the pupil, it can reflect off the red blood of the retina (the light-sensitive lining at the back of your eye), and bounce right back out through the pupil. If this happens, the person in the photograph will appear to have glowing red eyes. To avoid this, photographers move the flash away from the camera lens. With this arrangement, the light from the flash goes through the pupil and illuminates a part of the retina not captured by the camera lens. @Anguyennn