Yes, as we know, lazy eye is characterized with much lower eyesight compared with the normal standard, the reason of which can also be comprehend as delayed development of one eye or both eyes. So this is also why many children suffer from lazy eye. The eyesight development of both eyes can be unbalanced mainly due to the environmental factors. Because children need proper and continual stimulations to realize the development of vision, if one eye gets more stimulations than the other during a certain period, so will this eye develop better than the other, which makes the difference between the dominant eye and disadvantaged eye. If the environmental factors, especially the light in house couldn’t be changed, the dominant eye will keep on depressing the other, causing the vision of the weak eye to always stay on a primary level. An eye patch can be used to block stimulation to the dominant eye, so as to limit its depression to the other. In such a condition the vision of the weak eye can be expected to develop to a higher level, and the eyesight of both eyes can be gradually corrected to a similar and normal standard.