Swollen, sore and watery eyes can be caused by a variety of reasons, including improper use of the eyes due to personal habits, long-term use of electronic devices, and looking at mobile phones in a dark environment, all of which can cause swollen, sore and watery eyes. It can also be caused by diseases such as conjunctivitis, dry eye, keratitis, etc., accompanied by other symptoms such as blurred vision, pressure and congestion in the eye, and a lot of secretions, which require a visit to the ophthalmologist.