In those last years, when my life seemed to have been shrouded in an invisible damp mist, she was the torch by whose weak and gentle light I could guide my steps.

NPR: Excerpt: 'Esther's Inheritance'

In it, he uses eye drops made of a special riboflavin (a type of vitamin B) formulation and a very weak ultraviolet light to strengthen the collagen fibers in the eye.

FORBES: A New Hope for Those With Down Syndrome...And a Rare Eye Disease

It did not seem to her a natural light, and in weak moments she thought, This is the crossing-over time.

NEWYORKER: Pumpkin Head