Chronic pain: Pain (an unpleasant sense of discomfort) that persists or progresses over a long period of time. In contrast to acute pain that arises suddenly in response to a specific injury and is usually treatable, chronic pain persists over time and is often resistant to medical treatments.
Less common conditions that can cause a lazy eye include: 1  an eye disease such as a sore on the transparent layer at the front of the eye (corneal ulcer) or a scar. 2  childhood cataracts â clouding of the lens of the eye that's present from birth. 3  a droopy eyelid (ptosis)
In cases of crossed eyes, there is one eye that is off-focus from the object the person is trying to see. The brainâs natural tendency is to ignore the off-focus image, leaving the eye that produces it underused and weak. After time, this weakened eye may remain out of position, resulting in lazy eye.