Patient H69

Imagine how it would feel to one day wake up and find your vision descending swiftly into darkness.

Your fingertips are turning numb, and, as the world closes in around you, you realise there is nothing you can do to stop it.

This is what happened to Vanessa Potter. In the space of 72 hours, Vanessa went from juggling a high-flying career as a producer and caring for her two small children to being...