As my olde Irish Granny would say, "that's one brilliant fookin' fly mask."  We live in a dry, hot climate beneath more UV light than any sensible person would imagine possible, and my mare's sensitive eyes have been chronically runny her entire life. 

The Guardian Mask, besides screening out the harsh light and dust particles, has the added advantage of never coming in contact with the orbs of her eyes or her lashes, thus reducing irritation even further. 

I've owned Cali for nearly six years and her eyes have never been this good.  She's in a pasture with six other horses and will not let any of them mess with it, at all!  In short, she loves it and looks at me like I'm a total space cadet should I forget to put it back on after a ride.