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)
Eye Twitching, also known as blepharospasm or myokymia, is a sudden, involuntary movement of the eyelid; it is also referred to as an eye muscle spasm. These spasms often occur in stressful situations or when the affected individual has gone too long without sufficient rest.ther common eye twitch causes include: 1  Stress. 2  Irritation of the Cornea or Conjunctiva. 3  Fatigue/Lack of sleep. 4  Prolonged staring at a computer screen or television. 5  Excessive caffeine intake (e.g., coffee, tea, caffeinated sodas). 6  Nervous system disorders.