Eye trouble sure has been on and off for me.
As for "Grocery Store Syndrome", i believe mine was pretty much entirely due to bad lighting. I had to wear dark glasses and a hat to shop back when my eyes were bad, just before diagnosis of MS. Now, I don't have to wear these to shop, although my eyes would become weary and blurry if I were in the store for a long time. I had to wear dark glasses when a community college teacher too, because the Dean wouldn't let me change the flourescents, even at my expense and with a doctor's note. That was a long time ago.
Now, my biggest eye problem is the smoke we have in the summer. I am hoping we don't have it this year, in spite of the drought. We may get an El Nino in time to bring rain and settle smoke from distant fires. I had to evac last year and the year before.
The 2011 evac was a "mandatory evacuation". The fire came right up to the perimeter of town and was put out by a thousand fire fighters. Last year was just smoke from five fives 20-40 miles away, but I still had to go.
My eyes blur and spasm in such smoke, and even began to roll back in my head, which sounds like a seizure but it's not like grand mal...I have no idea what it is. The eye doctor says my eyes are good but the "action" is in my brain behind my eyes. I can go temporarily blind from smoke--for ten minutes at a time.
It was eye problems which got me the MS diagnosis after MRI and Visual Evoked Response tests. The problem went entirely away after eight years and stayed away until "smoke time."