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)
What Causes Eye Flickering: Eye flickering or eye twitching is quite common among people. 1  Usually, the bottom eye lid is the one that is involved in twitching, but quite often the top eye lid may also begin to twitch. 2  This flickering or twitching can be very annoying.