How does atropine work on your eyes?

Dilates & relaxes it. Atropine is a long-acting drop that temporarily both dilates the pupil and paralyzes the focusing muscle. Its effect can last a week or more. It is used in inflammatory conditions of the eye, like uveitis, to increase comfort and promote healing. With great care it is also used to assist in determining the need for glasses in children. Children with crossed eyes are often examined after using it.