In 1992, when Henry Grunwald missed a glass into which he was pouring water, he assumed that he needed new eyeglasses, not that the incident was a harbinger of darker times. But in fact Grunwald was entering the early stages of macular degeneration a gradual loss of sight that affects almost 15 million Americans yet remains poorly understood and is, so far, incurable. In Twilight, he chronicles his experience of disability: the discovery of what medicine can and can t do, the clouding of his sight, the daily struggle to overcome its physical and psychological implications. This is a...