In Twilight, Henry Grunwald recounts his growing recognition of vision loss, and the course of treatment that he pursued as he struggled to learn more about what was happening to him. Macular Degeneration means living in a veiled world. A sunrise, mountains, or buildings are still discernible, but always through a haze. Outlines of people remain, but without strong light, faces are a blur. Eye contact is impossible, distinguishing colors difficult, reading a source of increased frustration.

In Twilight, Grunwald writes about the evolution of the eye, artists who have battled loss of vision, and as one loses the ability to "see" meaning -- in other words, how one turns inward to find new sources of meaning.