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Hi Paramedic07
Of course they are your chickens, and all the choices are yours, and of course all the frustration is yours too....
You may take the approach of putting a few drops of paraciteide on the backs of the necks of your chickens. The product must touch the skin and not be absorbed by the feathers or fluff. We have cattle so I used Cydectin after checking with one of our vets. (but that was for Gapeworm...my chicken had several types of worm) The products that contain Ivermec,Ivomectin etc. (the same product that is in the monthly heart-worm pills for dogs) will kill worms and is less invasive, perhaps than going down their throats. There is an egg-withdrawal period of 14 days.
I used Vet RX and did need to repeat a few times. I think Vet RX is a
mechanical method of flushing out the worm, and the other medicated methods are
medicinal. (are you a paramedic?? it should be a piece of cake for you).
Here are some posts....
https://www.backyardchickens.com/forum/viewtopic.php?pid=6987705#p6987705
within is more eyeworm info, and a link to the book written by the discoverer of eyeworm in chickens.
Once they thought the only cure for eyeworm was surgery. Subsequently, I have found an eye drop, reputed to cure with 2-drops in the chicken's eye and prevent with one drop once a month. (got if from New Tree on line, the company is located in the Phillipines. ) So the cures have become easier.
Regarding re-infection the parasite lifecycle has an intermediate host a surinam cockroach. IF there is any wood pile or wood debris or any other locations that roaches could hide out, then removing them can break the cycle. without the roach, the parasite lifecycle is not completed. Also the time from the roach eating the egg in the chicken droppings to the time when the larvae inside the roach that the chicken eats can infect the chicken is 4-months. Wild birds and game birds are supposedly a big part of the eyeworm lifecycle, especially pheasants. Any debris where the roach could hide if removeable (like a woodpile) can help break the lifecycle.
As discouraging as it is, don't give up. Perhaps you are nearly there (cured)