Interesting Marvin!
I've been severely low in A on several occasions because I was craving the orange veggies. I had stopped eating the higher carb veggies like carrots, yams etc..as I suppose many of us have to keep the carbs down.
Perhaps it's time to eat more of those and cut carbs somewhere else.

Do you remember A&D ointment? That was always used on cuts and scratches before the invention of antibiotic ointment. It had its market share basically stolen by the antibiotic but maybe it was a much better product for us since the recent discovery of antibiotics overuse.

So you really think it improved your vision?