Fixing Eyes that look Yellow and Crusty on Composition Dolls

I had a couple dolls come in our hospital that had this very yellow eye crust over their eyes. At first I thought it was build up or gunk, but as I researched it, it's actually dried out plastic from an iris plate set into the composition eyes. I watched this video which was invaluable as to insight. In the video she punctures the plastic (brave if you've never done it before) until the iris completely cracks into pieces and you remove it with tweezers. After the gunky iris is completely removed, you see a cavity in back in which you can replace a lense looking iris into the spot and snap it back to restore the eyes. You don't even have to remove the eyes from the head and can do it all from the front.

The hardest part I think now is figuring out what size iris you need to purchase. I found a few sizes on eBay to experiment and have whatever doesn't fit as extras for future projects. Now I only get composition dolls occasionally since we usually work on 1950's and above, but sometimes they come in our donation center as they have no where else to go. Now I have a method of repairing those eyes.