I believe in supplements. I have a friend who was going blind but stopped it by taking Bilberry and Lutein supplements.
She needs glasses for reading, but her distance vision is pretty good.
My grandson has vision problems and is also taking Bilberry and Lutein along with other supplements to help his eyesight.
Just a thought - you might want to try. Can't hurt as there are no side effects.
Are you on any medication, sometimes a side effect of medications can be dry itching eyes, I suggest checking the side effects of any you might take. This might give you a cause, but of course, won't necessarily give you a cure.