Amblyopia (Lazy Eyes)
Amblyopia means decreased visual acuity due to underdeveloped visual pathway; the nerve connection to your brain. However, the eye structure is normal and healthy. For a person to see well, healthy eyes and healthy visual pathway are required. The cause of the underdeveloped visual pathway could be due to uncorrected refractive error, squint or untreated ocular disease, e.g. cataract.
In general, all these conditions develop during childhood and it may not be treated effectively in children aged more than 7 years old. Therefore, an eye check-up ideally should be done at the age of 4-5 years old in all normal children. Children who wear glasses should have scheduled eye examinations yearly.