Over the past couple of days, from a sliver of shiny orb, Oscar's eyes have almost fully opened. I don't think he's actually focusing with them but he is aware of light and dark. I try to feed him so that he's not staring into the overhead kitchen light.
And of course, he's grown strong now that he is eating his fill at each meal and he crawls around his larger new hamster-cage-home. Even before his eyes opened, he would explore, navigating the circumference and sniffing interestedly.
I have set up a water bottle but so far, he is unaware of it.
So a milestone has been met. Baby squirrel Oscar can see!