Lazy eye also known as amblyopia is a medical condition that causes the eye to see faint or blurred images and which normally affects only one eye. (Definition here)
This treatable condition is not caused by any physical condition to the eye but by the brain functions and its best treated when a person is still young before the brain functions are fully developed.
The brain subdues nerve impulses from one eye thereby making it ignore impulses from the affected eye. It is normally noticed in children and if not treated early it can become a permanent condition. Ophthalmologist advise to perform eye exercise specifically designed for lazy eye with affected children in order to treat the condition as earlier as possible.
Parents are normally advised to screen their children before they reach school going age in order to diagnose this condition at an earlier stage. Diagnosing it involves visiting your doctor who will administer a few test to determine if the eyes respond to light or if they move normally.
Exercises involve covering the stronger visioned eye with an eye patch for a specified period of time so that the brain can only accept inputs from the affected eye. The eye patch is used with thick rimmed glasses that cover the stronger eye leaving the weak eye to do the focusing.
Initially it will be hard for the weaker eye to focus on an image but with time the vision becomes stronger and it can take weeks or evens months for the weak eye to have a good vision.
The use of this patch may prove uncomfortable to a child as the child will be advised to do close-up activities that require the eye to differentiate colors or images but with a little encouragement from a parent it can be a success.
This type of exercise is recommended before the child reaches seven or eight of age as its considered most effective before then. This treatment is effective is this exercise is repeated about two to six hours daily for a period of three months.
After this period the child is then taken back to an ophthalmologist who will check on the progress of the eye and give further recommendation if needed.
Exercise for lazy eye will not guarantee full treatment of the condition but it is thought to improve the vision of the affected eye greatly. These exercise have been tried and tested on adults but with inconclusive results. (See here for more information)