Atropine was formerly used to dilate the eyes during an eye exam. However, atropine formulated at a very low concentration minimizes the side effects of dilation and most children do not experience side effects. While the low dosage has been considered safe on multiple clinical trials, every drug has side effects. It is possible your child might experience enlargement of pupils, increased light sensitivity, or reduced vision up close. Atropine is used off-label for the treatment of myopia progression.