There is no more marvelous organ in the body than the human eye. After evolutionary ages, the eye has become probably the most exquisitely adjusted, perfectly controlled and wholly extraordinary of all our organs. It has the strength and endurance, normally, to give perfect service for a long lifetime. Its function of sight is a channel through which you know the world you live in the chief instrumentality in doing your work.

The function of sight is unexplainable. We know that we see, but how we see no one knows. We do not see with our eyes, but with a portion of our brain-and that portion is in the back of the head! Our eyes are mainly a series of lenses and media through which light-rays pass to be focused accurately upon specialized nerve, tissues in the back of the eyeball. In some unknown manner these impulses travel back over the optic nerve, over which they reach the center of sight in the back of the brain. The process is not unlike that used today for the wirephoto: a picture is not sent as a picture by the wire photo process, though it starts at one end as a picture and the impulses that travel through the air are picked up and reassembled as a picture at the end. As with vision, the image itself does not travel back over the optic nerve to the brain, there to be registered as a picture, which seems to be recorded in the eye. Vision truly is a marvelous thing, and the eye is truly and extraordinary organ.

One whose work depends largely upon the constant us e of the eyes needs strong enduring eyes that are capable of a long day’s work without fatigue or strain. But whether or not you need your eyes for work, you need them for many of the joys and delights of this world, and vision becomes one of the first essentials of happiness.