“We train the horses with the aim that they will become grand prix horses, not just para horses” IN FRONT of Nicola Naylor there is a visual vacuum. Only white light or blackness. There are no colours, no shapes, not even outlines of forms. Every day since she was 22 years old, this is how the dressage rider has perceived the world. When she rides into an arena, neither the judges, their boxes, the white boards, the markers, nor the sand surface are visible to her. Photographers, spectators and stewards are unseen too, as are her horse’s ears just a few feet in front of her, the glossy sheen of the hair on his neck, his row of perfectly spaced plaits. And she has no idea whether the day’s sky…