One similarity is the concept of an unseen threat. In both the movie and the real story, there is something that makes it dangerous to look. Another similarity is the survival aspect. People have to find ways to survive in a situation where their normal way of life is disrupted, just like in the movie where the characters have to blindfold themselves to avoid the danger.
The main similarity between the 'Bird Box' movie and the real story is the core idea of a threat associated with sight. In the real story, there were events that made people cautious about using their vision, and this is directly translated into the movie. Also, the sense of isolation and the need to adapt to a new and dangerous situation are common in both. The characters in the movie, like in the real - life inspiration, are forced to come up with new strategies to stay alive in a world that has become extremely hazardous because of this threat.