Oh so I have a Fankid that lost his arm before entering the game and used a prosthetic one before, i wanted to know if he'd have his arm back after he god tiered? And If one person would get their eyesight back after god tiering??

Only if they wish for these injuries to be healed. For example, if the prosthetic arm was something he liked about himself or felt pride in then it won’t heal during godtier. But if it’s something he didn’t want, like Vriska and her metal arm then it will heal.