Perhaps, the most confusing symptom is the respiratory infection. A patient might think he’s having the regular flu or cold, but, in fact, it can be the symptom of conjunctivitis. The thing is that this disease is the result of eyes interaction with certain bacteria or viruses which often are similar to the ones we experience when catching a cold. The patients feel weak, sneezing too often, the desire to a cough, and other signs that usually identify cold or allergy.