Watch for other symptoms like nasal drainage, crust in eyes, and any kind of wheezing or coughing. If you start seeing these symptoms you will need to get them on antibitics quickly. Respitory infections can be very bad in chicks. Do you have any pictures of their swollen and irritated eyes? For...
How old are the chicks? Do they have any other symptoms? Are there eyes swollen? Do you think the other chicks may be pecking them? If not Eye infections can be a sign of a respitory infection and must be treated with antibiotics.