Lazy eyes, also called amblyopia, which is its medically name. Generally speaking, lazy eyes is a disorder of the visual system that is characterized by a vision deficiency in an eye. Many people are unaware of they have the condition until tested at older ages in that only have a mild form is hard to be found by people eyes. However, people who have severe amblyopia may experience related visual disorders, most notably poor depth perception. There is no doubt that wear contact lenses can cause lazy eye. Wearing contact lenses in a long time not only causes fatigue, but also increase the burden of being lack of oxygen and blood. While amblyopia results from developmental problems in the brain.