I've just noticed there's a bad smell too..
Hi @zombieduck
Can you post a clearer photo?
Can you take him to a vet?
Also can you give a hint about your location in the world - that is helpful as well

It's hard to see in the photo - but it looks like your chicken has crusty yellow pus in the eye along with facial swelling. Have you noticed mucous from the nostrils, sneezing, coughing as well?
You also mention there is a bad smell - is that coming from the discharge from the eyes/face?
I am inclined with the swelling, eye crust and bad smell you are dealing with a respiratory disease like Infectious Coryza instead of eye worms. Flush the eye and remove any pus that you see. Apply some Vetericyn Eye Gel or Terraymycin eye ointment. If it's infection due to respiratory illness, he may need antibiotics as well, if you have a vet that can help you that would be good.
If it is eye worms, you should be able to see worms in the eyes. See the link that @coach723 gave you - it has some good info on worms.