The poor man is probably terrified.
He imagines that he is going to have to stop driving and doing all sorts of things that are dear to him but require good eyesight. No wonder that it is his one preoccupation.
He sulks because he does not want to confront his fears.
Try to allay them, (Don't be surprised at him not believing you) so that you can find your way through this TOGETHER.
It may be difficult, but support and communication will help both of you. He must not feel that he is on his own with this.
Gary Glitter programme Tuesday
How does a 'lived experience' differ from an 'experience'?
apple trees not flowering this year. Anyone else?