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.
In some children lazy eye is caused by a combination of strabismus and refractive problems. Deprivation. Any problem with one eye â such as a cloudy area in the lens (cataract) â can deprive a child of clear vision in that eye. Deprivation amblyopia in infancy requires urgent treatment to prevent permanent vision loss.
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.