I am so sorry that he will lose his vision.
Check out Lighthouse for the Blind, they are a great resource.
Have you seen this? I know it's for northern CA residents, but not sure where you are located and if the Lighthouse for the Blind in your area has anything similar:
A Few Spots Still Open in Our Innovative Introduction to Blindness Group at Our Napa Retreat - LightHouse for the Blind and Visually Impaired