Carefully evaluating the pupillary light reflex (PLR), both direct and indirect (consensual), is critical when assessing the prognosis for vision, particularly in patients with glaucoma. So properly performing this quick and easy evaluation is essential.

Atropine is a strong parasympathetic blocking agent. When applied topically, it causes pupillary dilatation that may last several days. Topical atropine should be administered only when this degree of pupillary dilatation is desired, which is not often.