Just grow nerves to the stem of the brain. Axons could do it, they did for everyone who was born with healthy eyes. It would be quite an achievement though, be

Just grow nerves to the stem of the brain. Axons could do it, they did for everyone who was born with healthy eyes. It would be quite an achievement though, because axons navigate their way by a gradients of some chemicals, which probably dissipate with age. And problems will not end when nerves have grown. Brains would need to learn how to use them.