I was informed about certain Ray´s eye illness. Also, knew that Ray wrote a non fiction book regarding eye illness fight. Does anyone know the name of that book?

Jorge, I am not familiar with a Bradbury book on this subject.

I wonder if you might be confusing Bradbury with Aldous Huxley. Huxley had a degenerative eye problem, and in 1942 published a book called THE ART OF SEEING. It discussed the "Bates method" of "improving" vision.

Bradbury was a friend of Aldous Huxley, and Bradbury read THE ART OF SEEING.

Confusion might be easy as not only did these authors know each other but Bradbury's eye problems have persisted since childhood.