Years ago, my horse had one eye removed due to severe Uveitis damage.  While he was recovering, I used a "recovery mask" made by Protective Pet Solutions.  The mask is made of heavy duty PVC and will not collapse.  It comes in clear and dark tinted.  Both have 90% UV protection.  Can be used in pasture and riding. I left it on my horse 24/7- dark during the day, clear at night.  I'm glad I kept the masks as my horse has been diagnosed with Uveitis in his remaining eye.  When he's experiencing a flare, I now put one of these masks on him to keep him from rubbing the eye.   He is also EMS.
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Ronelle and Yoyo
2015 Bend, Or, US