If you look away from this book and focus your eyes on a distant object, the eye muscles _________ and the lenses _________ to focus images on the retinas. a. relax . . . flatten b. relax . . . become more rounded c. contract . . . flatten d. contract . . . become more rounded

Verified step by step guidance

1. Understand the role of the ciliary muscles and the lens in the eye when focusing on objects at different distances.
2. Recognize that when focusing on distant objects, the ciliary muscles around the lens relax.
3. Acknowledge that the relaxation of the ciliary muscles causes the lens to become less rounded, or flatter, to adjust the focal length for distant vision.
4. Identify the correct combination of muscle action and lens shape change when shifting focus to a distant object.
5. Choose the option where the eye muscles relax and the lenses flatten, which is necessary for focusing on distant objects.