Judy,
I thought my red, itchy, gritty, swollen, tearing, eyes was from allergy. I used anti-allergy drops for years. Now my Neuro-Op says it is dry eyes, like Sjogren's, (not tested lately for this one, I have enough Dx's).

So I use Blink or B & L eye drops, for dry eyes, rejuvenator ones. It worked. B & L is from Wal-Mart, they have Blink too, but the eye dr gave Blink samples to me. It is now gone, all the problems. I use it often, like he said, it took a months to get better.

The corner of the eye would get a ball of crust and block the tears from lubricating the eye.

I thought I had pink eye. In fact my pcp gave me drops for pink eye and it wasn't. Once I started the dry eye drops, that is what helps.

This may not be your problem so see an eye doctor to be sure. This was just my experience. I hope you find the answer.