View full lesson here: http://ed.ted.com/lessons/could-a-blind-eye-regenerate-david-davila

We tend to think of blindness as something you're born with, but with certain genetic diseases, it can actually develop when you’re a kid, or even when you’re an adult. But could blind eyes possibly regenerate? David Davila explains how the zebrafish’s amazing regenerative retinas are causing scientists to investigate that very question.

Lesson by David Davila, animation by Eli Enigenburg.