Not every eye infection is caused by a respiratory virus. I've dealt with my share of minor eye and sinus infections in my flock, and never had any develop into a full blown respiratory infection, usually virus caused.
I've found that Neosporin works every bit as well on eye infections as the more costly Terramycin, and it may not be available in California due to the draconian restriction of all antibiotics for livestock and pets. You can make your own saline solution. Recipes are on the internet. Use distilled water for the safest solution and only pure salt, not iodized.