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).
Lazy Eye (Amblyopia) updated July 3, 2015. Lazy eye (medically known as amblyopia) is a unique vision disorder. Its development and progression have more to do with the brainâs ability to process visual information received from both eyes than a defect in the structure of the problem eye itself.