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.
Common causes of the condition include: 1  Muscle imbalance (strabismus). The most common cause of lazy eye is an imbalance in the muscles that position the eyes. 2  Difference in sharpness of vision between the eyes (refractive anisometropia).
Amblyopia (Lazy Eye). As a child, if one of your eyes can't see well, your brain sometimes favors your other eye. This condition, called amblyopia, may happen because of an alignment problem of the eyes (strabismus or crossed eyes) or poorer vision in one eye.