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)
It is unknown what exactly causes eye blisters, but they are most common in the elderly and generally occur in those who spend a lot of time outdoors without proper sun protection for the eyes. The smallest type of eye blister, the pterygium, is generally painless and may come in small clumps of tiny clear lesions. They may occur almost anywhere on the eye, including the cornea, and can sometimes cause temporary vision changes.