In bright light, the pupil constricts to reduce the amount of light entering the eye. In dark or dim light, the pupil dilates to allow more light into the eye to improve vision. Normal pupil size tends to range between 2.0 and 5.0 millimeters, depending on the lighting. The younger you are, the larger your pupils tend to be.
Fecal incontinence is commonly caused by altered bowel habits (generally diarrhea, but also constipation) and conditions that affect the ability of the rectum and anus to hold stool. The sphincter muscles become weaker as you grow older.
Bowel incontinence, also known as fecal (UK: faecal) incontinence, is an inability to control bowel movements. The person's stools (feces) leak from the rectum uncontrollably. Bowel incontinence can vary in severity from passing a small amount of feces when breaking wind, to total loss of bowel control. Bowel incontinence is a sign or symptom of a condition or disease; it is not a condition or disease in itself. Generally, bowel incontinence is not life-threatening and does not impact negatively on the patient's health.