Eye irritation is a common condition that can be caused by a variety of factors. One of the most common causes of eye irritation is a STYE, which is an infection of the eyelid caused by bacteria. A STYE is characterized by redness, swelling, and pain around the affected area. Treatment for a STYE usually involves antibiotics and warm compresses to reduce inflammation. In some cases, surgery may be necessary to remove the STYE.