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.
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.