Freeze the layout of his stable
A horse whose sight is going navigates by memory and by the map he builds through his feet, whiskers and ears — and that map only works if nothing moves. Choose a position for everything in his stable and make it permanent: water bucket in the same corner, hay in the same place, feed bowl in the same spot on the floor, bedding banked the same way. Resist the helpful urge to deep-clean and rearrange; a stable that looks identical to a sighted person can be a new country to him if the bucket has crossed the box. The same discipline applies outside his door — the stretch of yard he walks every day should keep its shape, with wheelbarrows, jump wings and hosepipes never parked in his route. If he must move stables, walk him through the new space slowly on a lead rope, let him explore its edges and find his bucket, and expect an unsettled few days while he draws the new map.
Remove the things failing eyes miss
Walk his stable, yard and route at his head height and look for what a half-seeing horse walks into: bolt ends and latch fittings protruding at face level, low beams, the sharp corner of a manger, a hay rack edge, a half-open door left at exactly the wrong height. Pad what cannot be removed — foam or rubber edging on door frames and corners earns its keep the first time he misjudges a doorway — and round off or cover the rest. Buckets and tools should never sit in his walkway, and rugs and headcollars hang on their hooks, not on the gate he passes. Check his fencing with new eyes too: plain wire he once saw easily can vanish for him now, so a visible top rail or a line of electric tape at his eye level marks the boundary he can detect by touch before he is on top of it. Good light in the stable helps whatever sight remains, while sudden switches between bright yard and dark box are the hardest moments of his day — give him a pause at the door to adjust.
Handling that tells him what is coming
Most frights for a horse with failing sight come from being touched by surprise, so build a ritual and never vary it: speak his name as you approach, come in on the side where his sight is better if one eye is worse, and rest a hand on his neck or shoulder before your hands go anywhere else. That first touch tells him where you are and that it is you; keep a hand on him as you move around him so he can track you by contact. Teach consistent voice cues for the things he used to read from your body — a word for stepping forward, for standing, for a turn — and use the same words every time, in the same tone. When leading, walk him through changes rather than letting him discover them: pause and let him feel a step down, a change from concrete to gravel, a threshold.
Turnout and companionship he can navigate by ear
Turn him out in the paddock he knows best, with fencing he has already mapped, and resist rotating him around new fields. A steady companion is worth more than any gadget: horses with poor sight anchor themselves to a trusted field-mate, following his movements and grazing where he grazes. A small bell on the companion's headcollar or rug gives your horse a sound to steer by, and many blind and partially sighted horses learn to track it astonishingly well. Keep the pair together at bringing-in time so he is never left calling alone in a field he cannot scan. All of this only works if every person who handles him does it the same way — the frozen layout, the voice-first approach, the fixed bucket corner — which is why writing the routine into KinsLe Care Teams, where each helper sees the same handling notes and every task is timestamped as done, protects him far better than a reminder taped to a feed bin that peels off by spring.