Your comments about horses going blind were certainly right on for my Arab, Velvet.  He became rather nervous or scared sometimes in the evening when the horses had gone in their pens and he was still standing there in the dry lot.  He usually managed to get in his pen okay, but one night, I got tired of waiting for him and went and got a rope to lead him into his pen and he walked right into the pen wall next to his!  That is when I called the vet!  His blindness was from Uveitis though.  
--

Ferne Fedeli  Magic & Jack   2007

Point Arena, Mendocino County, California
Case History