![TED Talks Daily (SD video) show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/026/759/small/tedtalks-video.png)
Summary: When does vision loss become blindness? Writer, audio producer and editor Andrew Leland explains how his gradual loss of vision revealed a paradoxical truth about blindness -- and shows why it might have implications for how all of us see the world.