Eye troubles refer to a range of conditions that can affect the eyes, including styes and sties. A stye is an infection of the eyelid caused by bacteria, resulting in a red, swollen bump on the eyelid. Sties are similar to styes, but they are caused by a virus and appear as small, white bumps on the inside of the eyelid. Both styes and sties can be painful and cause irritation and discomfort. Treatment for both conditions typically involves antibiotics or antiviral medications, depending on the cause.