Originally Posted by oakzori
I just had a vet check out my double blue eyed horse for any eye issues. He is a very jumpy sort and really freaks out over texture changes when trail riding and training and HATES HATES HATES shiny surfaces... Taken lots of time to get him to go over black asphalt. I finally had a chance to have a vet look at him and he said what I was thinking. Basically the horse has no pigment in the back of his eye (happens to be blue eyed as well) so when light shines in his eye it is extra bright where usually there is a dark surface for the light to reflect off of (sort of like snow blindness I guess but not as bad) So extra reflective surfaces are super bright to him and cause him to react more when he is already a tightly wound horse. He does great in dimly light arenas. -- I'd also have to say, use a lead rope and find out at what distance does the horse trust you to be on that side...20 feet away, 15 feet, 10 feet, or just close up. Someone could have beat the horse, I have also seen a horse who had their face fractured by another horse kicking it at a young age... you could also try using a twitch and use the pressure point on the nose. That sometimes works for just breaking through that initial fear of something new. Grab them by the nose until they start licking and drop their head and then just touch his face... I was mostly looking at this post to see if anyone had reflective surface issues with horses and history of pigment...but I'm not finding much out there.
Have you tried to see if something like a flymask helps dim the light for him?
Something that offers a lot of protection, like the Guardian Mask: Guardian Mask - Uveitis, Glaucoma, Cataracts, Eye Cancer & Eye Injuries