Redness. Infections cause inflammation. When the eye is inflammed you can expect redness and tearing. Depending on the type on infection you can also experience pain, discharge, decreased vision and sensitivity to light. You should see an eye doctor if you have any of these symptoms.
Pain, redness, blur. There are many types of eye infections, and they don't all look the same. Eye infections can be caused by bacteria or by viruses, and changes quite similar to eye infections can also be caused by other problems in the body such as autoimmune diseases. Warning signs include eye pain, redness where the eye is usually white, mucous discharge, and blurred vision. See your eye md if you're worried!
Watery. Watery mucous discharge, signficant crusting around eyelids upon waking almost difficult to open eyes, red eye, sometimes red eyelids, itching, burning, foreign-body sensation, a history of recent upper respiratory infection, contact with someone with red eye is common, generally infection starts in one eye and then spreads to the other.
Eye infection. Symptoms include redness, irritation, pain, discharge, blurred vision, foreign body sensation, and others. See an eye doctor.
Nonspecific. This may be anything from upper respiratory track infection (ie "a cold") to sinusitis, flu, or other viral syndrome.
URI. URI or sinus infection. See MD for evaluation/treatment.
Seasonal flu. Is very common viral infection. Usually the condition resolves on its own with home care. Drink water and get a good rest. NSAIDs (e.g. Aleve, Advil) or Tylenol (acetaminophen) are also recommended every 6 hours. If they continue for more than 10-12 days, you may visit your PCP.
Not sure. But frequent hand washing is key to lessen incidence of eye infection.