How do you develop an effective eye for distances in hunter jumper?

Developing an eye for distances — the ability to assess the horse's canter in relation to an upcoming fence and identify whether the horse will arrive at the takeoff point on a good distance, a long distance, or a short distance — is one of the most important and most discussed skills in hunter jumper riding, and it develops through a combination of systematic training, accumulated riding experience, and specific exercises designed to develop the perceptual skill. The foundational exercise for developing a distance eye is the placing pole — a ground pole placed approximately nine feet from the base of the fence that ensures the horse takes off at the correct distance regardless of the rider's judgment, allowing the rider to focus on feeling what the correct distance feels like rather than on finding it. Regular work over placing poles trains the rider's internal sense of what a correct distance feels like from the saddle, providing a reference point that the eye then learns to identify in the canter approach before the fence. Ground poles set at trot and canter distances develop the rider's sense of the horse's stride length and how the approach to a distance actually feels at different points in the approach. Working with a trainer who calls the distance as it appears — long, short, or good — develops the rider's ability to identify what they are seeing rather than simply reacting to whatever distance they arrive at. Video review of jumping rounds is particularly useful for developing the distance eye because it allows the rider to see their approach from outside the horse while simultaneously connecting what they saw from the saddle with what the video shows was actually there. The most important element of developing an effective eye is accumulated experience over many horses and many fences — the distance eye is fundamentally a pattern recognition skill that develops through exposure to the full range of distances rather than through any single exercise.