Andrew Leland, writer and author of “The Country of the Blind: A Memoir at the End of Sight,” shares his experience of slowly losing his sight after being diagnosed with retinitis pigmentosa, a rare genetic eye disease for which there is no cure. From using a cane to learning braille and researching the history of inventions for the blind, Leland describes the accommodations he’s sometimes reluctantly made during his transition. Embracing the experience has expanded his perspective. Sometimes, he says, “the thing that seems to go wrong actually turns out to be the thing that makes it great.”