Color blind glasses for my color blind dad

My dad is color blind since birth. Whenever we go driving, he tells us what colors the stop lights looks like to him. He says that the red and green looks the same, and he can only tell which is which because he knows the position of the red and green lights. And whenever he sees flowers, he describes what color he is imagining the flowers would be.

He is now 55 years old. He loves taking care of plants and vegetables in our backyard, I just hope that someday he would be able to see how colorful his plants are. He's taking good care of them even though they just look plain to him.