I'll add that some snakes just have poor eyesight from the start- much like humans, I suppose. It has always been obvious that one of my corn snakes (an amelanistic one) has poor vision- his feeding response is quite good, but his aim? Well, if practice was going to improve it, it should have happened by now- as he's 14 years old. It's not about scent or temperature or fear or even shyness with him- & I don't think it's likely to be hyper-excitement for each & every meal. He just seems to see poorly. He wasn't one that I bred, so I don't know if genetics might have contributed to this, but it might have.
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