Emphasis Preaching Journal

The human eye is like a built-in camera. It opens and closes to let in light, it focuses, and records. It even has its own "zoom lens." The human eye can focus on objects anywhere from about three inches to infinity. When we look at distant objects, the ciliary muscles attached to the lens relax, and the lens becomes less curved, thus increasing the focal length. When focusing on nearer objects, such as words on a page, the ciliary muscles work to curve the lens, reducing the focal length and bringing the words into focus. The ciliary muscles act like a zoom lens.