In the Glossary of Science and Health, Mrs. Eddy says of eyes: "spiritual discernment,—not material but mental" (p. 586). I had an opportunity a few years ago to learn better the truth of this, when late one afternoon my wife and I were returning home from a twelve-hour drive. With less than an hour to go, abruptly, I could see nothing in the whole lower right quadrant of my peripheral vision, in either eye. I could, however, still see the road straight ahead. I immediately told my wife, and asked her to start praying with me.
Our prayer went something like this: God is all-knowing and all-seeing; man is the image of God and expresses only God, so man can't experience what God doesn't know. Because God is omnipotent, I didn't have to entertain any belief in a power that could impair my ability to express God accurately. We talked about true vision being a quality of Soul, God, a spiritual sense that couldn't be lost or impaired. I felt comforted and peaceful, not frightened—boosted by my wife's calm, confident trust that there was just no way I could be separated from God.
When we reached home, I helped unpack as I normally would, and then lay down to rest. At no time did my thought lapse from praying. I felt a calm, strong certainty of being cared for. After thirty minutes or so I opened my eyes and got up to help my wife finish putting things away. I could see normally—the trouble was gone and never recurred.