Another thing to watch out for:
When my mom lost most of her vision, she was extremely reluctant to give up her driver's license because it gave her status as a normal person. She was perfectly fine with not driving, because she knew it wouldn't be safe, but she wanted that license and not the equivalent state-issued ID card.
As it happened, there was a friendly neighborhood optometrist who gladly (for the price of an exam) filled out the DMV paperwork showing that her vision was good enough, and she kept renewing her DL for another decade. OP's father might know such a resource and evade the issue for a while yet.
When my mom lost most of her vision, she was extremely reluctant to give up her driver's license because it gave her status as a normal person. She was perfectly fine with not driving, because she knew it wouldn't be safe, but she wanted that license and not the equivalent state-issued ID card.
As it happened, there was a friendly neighborhood optometrist who gladly (for the price of an exam) filled out the DMV paperwork showing that her vision was good enough, and she kept renewing her DL for another decade. OP's father might know such a resource and evade the issue for a while yet.