My dad (currently 92) in his last years of playing golf early (2000-2010) had (still has) macular degeneration. It got to the point that he would line up his drive after teeing up his ball using peripheral vision, and then swing away- relying on his friends to follow the ball because he couldn't see it. He had to putt solely, again, using peripheral vision only. He still shot very low 50s.
It was a bit of a struggle for him to give up his license though... took all of us using family "persuasion". It's a hellava thing to ask to give up that kind of independence.
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