How do glasses help us see Andrew Bastawrous and Clare Gilbert

View full lesson: Today, glasses help millions of people with poor vision be able to see clearly. But how Andrew Bastawrous and Clare Gilbert help unravel the answer by explaining refraction the ability of a transparent medium, like glass, water, or the eye, to change the direction of light passing through it. Lesson by Andrew Bastawrous and Clare Gilbert, animation by Andrew Foerster.