In a previous example, you saw that when reading a book, your lens is rounder or more convex, but when you look up to see a student entering the library, your lens becomes flatter or less convex. What muscle action results in the lens becoming less convex?

• A. Ciliary muscles contract.
• B. Ciliary muscles relax.
• C. Pupillary constrictors contract.
• D. Pupillary dilators relax.