Carlos, the old "you can lead a horse to water......"
Some folks just don't want to listen.
Eye sight is one of those things that go bad on you so slowly you don't really notice it.
I know for me it was having trouble with orientation when I had a fast mover way out there. Then I started to notice when driving signs at a certain distance weren't real sharp looking.
One trip to the eye doc took care of that. Man it was like going from night to day.
Just have to admit we are all getting older, and stuff just doesn't work like it used to.