"'Preciate it!"

He excuses himself and heads out.

"...okay so live options are me you or Naruto I guess. I have the advantage that painkillers work on me and the disadvantage that I know how to do like literally two ninja things at all but I can cheaply recover if it doesn't work, you have a high opportunity cost and the most complicated surgical prognosis but are most likely to be able to operate the eyes, Naruto's sort of in the middle?"

"Probably not Naruto? He might have complicated surgical stuff too."

"I think 'finding out if this works' is most important?"

"I'm a cheaper test but a less clearly applicable negative if it doesn't work for me."

"Do you have a way you're leaning?"

"I'm inclined to just do it on myself but I don't wanna do it unilaterally."

"I don't have an objection."

"Okay then."

Cam numbs his left eye socket. And just like he tried with Tobirama, tries to slot in a Rinnegan under what he's got, omitting the original eye from his protective self-concept -

Sasuke suppresses a flinch and looks away, but nothing goes wrong with Cam's plan.

The Rinnegan, however, has some extremely difficult to interpret input. That is either more colors than Cam's used to, or it's seeing things not in the visible spectrum. Sasuke's glowing. There's a different glow on the ground, fading into the atmosphere. 

"...well it did something," Cam says, mopping up the previous eye. "For example you glow."

"...Maybe chakra? Is it concentrated in certain places in me, or more general - "

It seems to be more intense closer to his heart, but isn't really in any other groupings.

Cam closes his normal eye. "There's extra colors sort of in general, and it's glowing a little more near your heart but not forming a conspicuous circulatory system or anything."

"That doesn't sound like what I've heard of with seeing chakra..."

"It's possible I have to do something to make it more effective. I have no idea what though. The ground also glows, and it fades farther up."

"I don't know if that's nature chakra or - the eye's supposed to be able to manipulate gravity? But if it's visibly fading..."

"I mean, the pull of gravity does lessen farther away from the planet, but the dropoff doesn't look exactly like it maps to that."

He nods. "I don't know what the other options are..."

"Not sure. I'm going to get in the air and see if a different perspective helps." He spreads his wings and takes off.

There's no real variance in the planet glow - the glow around Sasuke seems to be around all of the people (including the snakes) with no extra brightness for shinobi. How bright the planet's glow is actually decreases far more slowly than it looks like it should from the ground.

Does the moon glow?

Yes, a lot less brightly than the planet but with the same sort of feeling.

Hmmmm.

He lands. "The moon glows, less than the planet, and the dropoff isn't as sharp as it looked from ground level, so that might be gravity. Also, people in general glow, including Shiromi and Kusana."

"Do you know if animals or plants glow?"

"There aren't many of either around but the tree I made the other day didn't and I didn't see anything that might've been a lemming."