It is also needed to make a light-sensitive substance in the eyes.

VOA: special.2009.04.21

Photodynamic therapy involves the injection of a light-sensitive medicine called verteporfin into a vein in the arm.

BBC: Age-related macular degeneration

That's the trick performed by holographic disk drives, which record a series of 1-million-bit chunks of data as holographic "pages" inside a light-sensitive plastic medium.

FORBES: Deep Storage

The goal was to substitute photoreceptors with a light-sensitive material capable of restoring photosensitivity to the retina, by easing down the retina on a layer of organic photovoltaic semiconductor.

FORBES: Artificial Retina From A Photovoltaic Polymer