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)
Causes of eye twitching. Eye twitching, or blepharospasm, is an uncontrollable blinking or spasm of the upper eyelid. Most people develop a minor eyelid twitch at some point in their lives. The causes include: Fatigue; Stress; Caffeine; This minor form of twitch is painless and harmless. It usually goes away on its own. But it can be quite annoying.