Eyes making recommendations

What materials are you using, what process and where does it get messy? Tools? Equipment? Previous experience with the materials?

 

When I tried casting my doll head, I had HUGE bubble problems. It was insane. Using the same resin for eyes caused a lot of bubbles too, at least for an open mold like that. I had better luck when I tried a different resin. Where are the bubbles ending up? Throughout the whole eye, or more where the iris would be? What difficulty are you having with the final drop of resin? Is it overflowing, or something else?

If you haven't done so, try using a toothpick to carefully drop small amounts of resin into the mold and work it into any nooks or crannies before filling up the rest of the mold.

 

What are you using to pour/drip the resin? Syringe? Funnel? Pouring straight from the mixing bowl? Try experiment with different methods. This is not a one size fits all kind of thing.
Epoxy is fairly insensitive to things like humidity, but it's still a good idea to monitor it. Do a couple of tests, making sure to note down temperature and humidity in you workroom. Then go back and see if you can see any difference in how much bubbles you get. Draft is another thing to pay attention to, even if I doubt that will make a lot of difference in a small thing like this, it's a good habit. If humidity isn't the problem it may be a reaction to something else that you use.

This may be a stupid question, but are you sure the resin you use can give good results in the cicumstances you work?
Have you tested the resin individually with all other materials you use with good results? Because if not, I think it's a bit premature to try to make a finished eye. You may need to do a bit of ground work first, to iron out the wrinkles, so to speak. You may have a resin that needs to be cast with a pressure pot or one that can only cure well in certain volumes or one that doesn't like the pigments you used for the sclera, or reacts with whatever you used for the colour of the iris and pupil, or one of the tools.

 

Regarding epoxy resin, it's important to check the way you are mixing (for me it works best to tilt the container with the mix and sway a stick side to side rather than stir in curcles) because that can fill the resin with bubbles. Tapping the moulds a little against the table once they are full can help a little too (like lifting them about 2mm and then dropping them).
If you are using one of those separated moulds (one for each size of eye) or so, in that case I'd advise fixing them somewhere with double sided tape at the bottom.
If your resin isn't curing right, you might like to check if you are working with the right proportions. If it never really finishes curing and ends with a sticky texture, you might need to add more of the curing agent.
I usually work with a cut plastic cup (so that it has a tip i can use to pour the resin) and mix it with a stick and depending on the size of the mould I pour or I let drops fall from the stick. Hope it helps!

 

I want to make dolls too, and I just want to say this thread had been super helpful.

If only pressure pots were cheaper

 

Amazon sell some great clear resins (no mixing) that use ultraviolet light to cure, I think they were originally made for fingernail art.
You can use this resin poured directly from the bottle nozzle and then just use a ultraviolet torch or nail curing light to set it.
I’ve been using these for irises and pupils and to give that glossy coating to the whole eye.
I have had bubble issues in the past using this liquid resin and I have found the best way to deal with it is to keep the bottle on its side once it’s more than half empty and NEVER to shake it, only tilt it and wait patiently for the resin to come out under its own weight. Keep a piece of paper kitchen towel nearby, and if any bubbles do start to emerge, just put the nozzle onto the tissue and deposit the bubbles there, then go back to the piece once the resin is running clear again.
A pin, can be used to tease out any bubbles while the liquid is still un-cured.
Hope this helps

 

Also, as an addendum to my last reply, I did have some issues with clear acrylic resin marking really easily even after curing under UV lights. I discovered an effective way to deal with this was simply to wait 24-48 hours before touching it. The resin will fully harden in that time.