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: Introduction. Lazy eye: Dimness in vision in one eye without apparent physical defect or disease. See detailed information below for a list of 24 causes of Lazy eye, Symptom Checker, including diseases and drug side effect causes. Â» Review Causes of Lazy eye: Causes | Symptom Checker Â».