In dim lighting, most peoples' pupils are no larger than 5 or 6 millimeters. Because of this, the view into the back of the eye may be restricted. By instilling eye drops that dilate a person's pupils (the medicine relaxes the muscle that constricts the pupil), a much more comprehensive evaluation of the health inside the eye can be performed. The effects of the eye drops include light sensitivity and blurring of a person's reading vision. We recommend regular dilated eye exams for healthy adults and yearly dilated eye exams for adults over 60, those with existing eye conditions and diabetics.