From the manufacturer About Us We are a family business, started in 1992 by SEN teacher Bob Hext, who was finding that the games he devised to teach his dyslexic students were more effective than many of the published materials available at the time. The parent Company is based in the UK. Since we patented the Eye Level Reading Ruler, Crossbow has become the UK brand for visual stress products, with reading rulers and/or overlays in over 60% of the schools and colleges in the country. The Crossbow logo has its origin in our (Bob and Anne’s) Christian faith. We believe that the symbols of the Cross and the Rainbow stand for the most powerful, life-changing truths on this earth. We try to run the company in a manner that is true to our principals, in the belief that Christ is our ultimate. We sincerely hope that this translates into a positive experience for you.