I have been treating my horse, who suffers from extreme photosensitivity, or Head Shaking Syndrome, with drugs during the last two seasons. Unfortunately, when I started him on the medication this March 15th, (the start of the season for photo sensitive horses), it just wasn't working. Riding him on trail and in the arena was unpleasant for both he and I. After discussions with my vet, he consulted with an eye specialist in his practice and she recommended your website. I ordered the dark ti...