Tbh if spray render will come to your eye it will be dry or just the aggregate. If the mix is stiffer and doing walls only you might not get any at all. The danger is when you get wet mix into your eye,which I don't use as excuse and always use mines btw.
When I had lime into my eye, the white part around the retina was hanging out like fried egg white and I couldnt close my eye for weeks. Had a bandage for a long time . What saved me was the quick way to the emergency, across the road. It was good 1/2 hour of pain pouring 1L botles down my eye. Sorry you couldn't get better outcome mate! Hope that will be a wake up call for some on here!