...I'm not really coming up with a lot. I know of several canons where eyes, magical or not, can be transplanted from one person to another, and I know of at least one dimension-hopping character who should be capable of creating artificial eyes (seeing as she at one point creates a fake arm that can bleed and, for some odd reason, grab ghosts), but I can't really think of any where there's a standardized magical eye replacement.

The fun thing about the PPC, though, is how easy it is to justify whatever type of plot device you want. Not only are there millions of canons Medical can steal from, but HQ isn't exactly lacking in the mad scientist department. Making up some sort of magically powered replacement is not out of the question.

In terms of technological-based replacements, though, my favorites are still the prosthetics used in Ghost in the Shell (specifically in the character Batou). They look sort of like camera lenses embedded in the eye socket and function the same way, identifying, isolating and zooming in on points of interest (such as weapons or writing) in a scene as the user observes them. Of course, they also might require having a computer installed in the user's brain to work properly...

Would, say, something along the lines of Moody's magical eyeball work outside the HP continuum? I ask because Foxglove's primary fandoms are magic-based, not tech-based, so it makes sense to explore magical options as well, if that's possible.

One of the sarcophagus in Stargate SG-1 should do the trick to heal the existing eye. Someone mentioned another method causing addiction problems, and the sarcophagus does also, but only over long time exposure-like daily for a few weeks. Initial personality changes after perhaps a week.

http://stargate.wikia.com/wiki/Sarcophagus

Anyway, the character is placed inside, the lid is closed and it heals everything, even the recently deceased. It would be on the safe side to have the damaged eyeball in the socket before placing the character in the sarcophagus.

The safest place to get access to one would be Season 1 episode 14, or one of the hundreds of fanfics based on that episode--it is one of the more popular ones to be written about. There is a sarcophagus in Stargate Command--Cheyenne Mountain, Colorado, Earth. It is unguarded and unused for hours during the episode. Just open a portal into the room, use it, and leave.

http://stargate.wikia.com/wiki/Hathor_%28episode%29

If you sneak into either the episode or a fanfic of the episode, do not take any males with you. If you accidentally encountered Hathor, they would be immediately under her spell, possibly even Stormsong. Her control is based on pheromones of a sort. I don't know how human pheromones affect Redwall creatures.

They're nifty, too - UV and IR vision included as part of the package, and zoom ability. The only downside is occasional headaches.

In the Cowboy Bebop anime, I believe the character Spike has a replacement eyeball. Other than an ever-so-slight difference in eye color, it's barely noticeable. And it apparently improves his aim.

Not that I know jack about Cowboy Bebop; I just came across that little tidbit when I was trying to find a possible eye-replacement idea for Jack. ('Course, then I decided to screw the idea and let Hilarity Ensue).

Though, Foxglove does strike me as the type who'd enjoy having a cybernetic eye. Like John Silver from Treasure Planet.

The most sure-fire way would be to let Foxglove use the morphing cube from Animorphs, turn into an animal, then turn back. This would "reset" her body to whatever her DNA coded for, including fully-functioning eyes. However, I suspect you don't want to turn your agent into an Animorph...

The other thing I thought of is the mana infusion chamber from Magic: the Gathering. One particular character used the chamber to patch up his body whenever he got injured, but it carried the side-effect of addicting him to black mana. That wouldn't be a problem for Foxglove if she only used it once, of course.

I guess the problem with these ideas is that Foxglove would get her ownn eye back, rather than a fancy sci-fi one!

G'Kar gets a replacement eye (which he can take out of his socket and still see out of--sort of a high-tech version of Moody's eye) in either the end of Season 4 or the beginning of Season 5, I can't remember.

...but it might not be too easy to get, because most stories set there would have only a very few characters capable of 7th level Cleric spells. It's pretty doubtful that you'd be able to find someone at HQ who can learn something of that level.

Your best bet is probably Cadderly Bonaduce, if you want to go that route; but make sure to catch him after he becomes a Chosen and before the Spellplague. Stay away from Danica, though; she's likely enough to be resistant to the neuralyzer.

The Star Wars novel Vision of the Future mentions replacement eyes briefly, so I'd imagine Medical could get their hands on whatever is used in the Star Wars continuum. The book is rather vague as to the exact process, so you could probably write it however you want. One of the characters has an eyepatch and when he's asked about it, he says, "Our medical replacement facilities are limited, and I opted to forgo a new eye in favor of others of my pilots who might need the operation."