Youngster too much for me?

My gelding started doing exactly the same as yours, would sit on him back went right up was tense the full time then asked for canter would explode and bronc and wouldn't stop till you were off. Long story short it was his saddle so I would 100% recommend checking your saddle, he did for a couple rides after have a 'pain memory' not sure if that's the best way to describe it, almost anticipating it to be sore but then settled when he realised it wasn't. He is a sensitive soul and if something is just slightly off he isn't slow in telling you!
This is obviously slightly different to your situation as he hasn't got uveitis however I have had a horse in the past who did although it was only in 1 eye. It was a long time ago and I was much younger but it didn't stop her performance wise, she showjumped. She did have to wear 'goggles' I remember tho and they could only come off at night when no lights on.
 
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