Have you brought in new birds recently?
Photos of the hens/eyes?
Bubbles in the eyes accompanied by other respiratory symptoms can often indicate Mycoplasma. Tylosin or the Doxy-Tyl can both be used to treat symptoms. Tylosin has a 1 day withdrawal period, but a comb with Doxy you would want to observe the longer 2 week period.
For eyes, it's best to flush with saline, push out any pus that may be causing swelling, then put an ointment in the eye like Terramycin. This would be in addition to any oral medications that you may administer.