As you may recall, my youngest son is visually impaired. In his left eye, he has light perception only. His right eye has a narrow field of vision, but he can see large objects pretty well and and small things up close. Print is difficult unless it's fairly large. He also has a hard time with his colors. He doesn't see the whole spectrum and needs high contrast to see the best. I made some color blocks for him to practice seeing the differences.
I purchased these one-inch wood cubes at the craft store and painted each side a different color. After they dried, I gave them a coat of Mod Podge. I love Mod Podge - it makes everything shiny ;)
One of the things we do is have him identify the color blocks that don't match the others and then he tries to find the colors that match. He likes the challenge and it seems to be helping exercise his eyes. Auntie made the coordinating pouch to store them in. She's the best!