In “The Country of the Blind: A Memoir at the End of Sight” (Penguin Press, 2023), Andrew Leland digs into what people mean when they use the word “blind,” as there are medical definitions, in addition to legal uses of the term, as well as social constructs and expectations. The medical definition is complicated, as only 15% of people who are blind actually have no vision at all. Instead, they have some sort of substantial hindrance to full sight, but those issues vary wildly. In fact, most of the people in the book are more like Leland, people with some partial sight, even if that is nothing more than distinguishing light and dark patches of the world.