I think this is really the only thing there is, without assuming there isn’t “complete control” over it. You either sacrifice total invisibility to be a floating pair of eyes (or at least 1), or you’re blind but totally invisible. Making it truly impractical even if you have full control over the ability.
What if light is just refracted around you. You would be able to see, but it would look all rainbow like.
Great take on this in a D&D setting where a players character was able to roll incredibly high to notice an invisible person. The DM came up with this solution on the spot and made fantasy and logic weave together for a believable solution and an awesome situation:
If everything but your pupils were invisible, and your pupils were 90% invisible, it’d probably be fine. Most humans can comfortably see with 10% of the light.
