Hey TU Folks!
I've learned so much from this community and have had a such blast interacting with you all that I thought I would try to give a bit back. I make my own eyes using waterslide paper, holographic foil, Photoshop, and epoxy. I cut the eyes out using different sized leather punches and one of the most difficult things for me in the past was getting the eyes themselves to print to the correct sizes, namely 10mm, 8mm, and 6mm. I have a friend who is a graphic artist and she came up with a Photoshop document that utilizes Smart Objects which allow you to click on one of three layers (10mm, 8mm, or 6mm) and embed whatever image of the fish eye you would like. The document then converts that image within the layer to the correct size for printing. No messing with print settings, image sizes, resolutions, etc. It takes a little bit of skill with Photoshop but nothing too complicated and I will gladly help anyone through it.
If anyone here would like a copy of this document with instructions just let me know. I'm happy to share it with you all!
Tight Lines!