Can you get floaters in a prosthetic ("glass") eye?

Question in title. Forgive me if it’s the stupidest question of the year.

Don’t see why. No nerves.

An eye “floater” is generally thougth of as the visual manifestation of the contaminant(s) in the eye, so no, you cannot get them on a cosmetic prosthetic eye any more than one can get them on an eye patch or spectacle lens.

Even if you could, you would not be able to see them.

It’s my understanding that glass eyes are solid glass, so there’s no be nowhere for something to float in… and since you’d have nothing to see it with anyway, it would be a moot point.

Thanks guys. I suspect someone accidentally entered “Left eye” (the glass one) instead of “Right eye” (which is still intact) on the paperwork. Just checking, so I don’t sound like an idiot when I ask the doctor. :slight_smile:

I didn’t know if maybe, possibly, the nerves could be sending phantom signals, like phantom limb sensations.

Now I want to patent a miniature glass eye aquarium…

Is…is that a fish???

it could have bubbles in it.

I don’t think you can get phantom nerve signals, but perceptually I get something similar. When I first enter a darkened room from a brightly lit one, and my vision hasn’t become adjusted yet, I get the distinct impression that the little bit I do perceive is coming from the blind eye, and that I’m not getting any input from the one with sight.

It’s strictly an illusion, but very disorienting. I call it blindsight.

Actually prosthetic eyes are not even transparent: they are made of white plastic. And they are not spherical, either.

http://en.wikipedia.org/wiki/Ocular_prosthesis

The pupil and iris are painted by hand on the back of a small piece of clear plastic (or glass, I am not sure about this) which is embedded into the rest of the eye.

Those would not be like floaters, though, more like phosphenes.

But I do not think it is possible anyway. The cell bodies of nerve fibers of the optic nerve are in the retina, which is in the eyeball, so if that is removed and replaced with a prosthetic, the optic nerve is going to degenerate. If there is any apparent sensation from the missing eye, it must be originating in the brain, possibly something like Charles Bonnet syndrome, which can produce unformed ‘simple’ hallucinations as well as complex formed ones. However, it does not seem likely that that would be described as “floaters”.

Also, I think Charles Bonnet syndrome depends on having lost access to part of the visual field, and you would not lose much visual field from losing one eye if the other is good, because the good eye would take up most of the slack.

You are probably right. It is probably a mistake, and the floaters are in the good eye.

I guess I have to say a word or two, since I am the expert on this subject here.

To begin with, I’ve heard about plastic prostheses, but they are an abomination, so let’s talk about glass eyes.

The prosthesis maker starts with a tube of opaque white glass, which is used to form balls of various sizes to fit patients of various sizes.

Step two is painting an iris and a pupil using coloured glass that melts onto the eyeball.

Now it’s time to meet the patients. Equipped with a large number of glass balls of various sizes with irises of different patterns and colours he chooses one that matches the patient’s other eye and proceeds to paint blood vessels and what have you to match it using red and yellow glass.

Now it’s time to make the real prosthesis. He attaches a small glass tube to the back side of the ball (this is actually the first thing he does to have something to hold it with when when painting the blood vessels) and begins to heat it up to make it soft. By sucking out the air inside he forms a double sided bowl that fits into the eye socket. This is done by comparing with an old prosthesis or using eye measure (pun intended). When this is done he heats up the inside of the bowl even more to free the suck pipe and make a smooth surface.

When the eye has cooled down it’s ready to use.

Put a worm/parasite in it.

Sea Monkeys!