My dad was telling me about a book he read as a teen about a group of people who had chlorophyll in their blood and had become part human, part plant.
Sunlight hurt their eyes, so they would make Goggles out of leaves, and if they stood still they could become a part of their surroundings and wouldn't be seen.
My dad is in his 60s now, so it was probably written before 1970, but he couldn’t remember the title or author. I searched online, but couldn’t find anything.
I would greatly appreciate any help identifying this work..