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.
Fecal incontinence is the inability to control bowel movements. This leads to stool (feces) leaking from the rectum at unexpected times. It is more common in women and in the elderly of both sexes. Many people who have fecal incontinence are ashamed to talk about this problem with their doctor.