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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...
As you get older, your eyes worsen and become susceptible to a disease called age-related macular degeneration — the leading cause of blindness, with no cure...
Visit to get our entire library of TED Talks, transcripts, translations, personalized talk recommendations and more. As you age, you gradually lose the ability to refocus...
