Just saw this.... years after you posted it.
I know about Oscar Wright, John's son. He was briefly under the care of my great aunt in an ophthalmic ward in a hospital in France during World War I. Oscar was a private in the headquarters company of the 26th Infantry Regiment.
She dealt mostly with blinded soldiers. He suffered from a disease of the choroid and was in a different category from the others, most of whom were totally blind for life. He left France in October aboard the S.S. Northern Pacific, which left from either St. Nazaire (more likely) or Brest (less likely) on October 24, 1918. Fortunately, he regained his sight at some point and returned to Kentucky. He died in a car accident in 1952.
This might be of some help. Hope so. All the best, Frank Herron