In my childhood, I know that some of my student are having a hard time seeing the blackboard because they are nearsighted or some of them are having a hard time reading up close because they are farsighted. In some cases children have difficulty focusing, which we call an accommodative insufficiency. We also see children with amblyopia, a vision development disorder caused by one eye not being able to see as well as the other. The brain sees two different pictures that it can't combine in a meaningful way, so it ignores the image from the weaker eye and chooses to interpret only the image sent by the stronger eye. The result is that the eye that isn't seeing well will not develop properly.If we can diagnose amblyopia early enough and correct the eye's refractive state by prescribing a pair of glasses, we may be able to rectify this developmental vision problem.
In fact,vision problems are common in school age kids,research has shown that one in four school age children have vision problems,and the vision problem can affect their personality,learning ability and so on. then need timely medical treatment. In my opinion,I think refractive errors are the most common cause of vision problems in school-age children. If your child consistently holding a book too close or sitting too close to the TV,closing one eye to read, watch TV or see better, or complaining of headaches or tired eyes, frequent eye rubbing,if these signs are present and your child is getting, you have to pay attention.
The most common type of vision impairment in children is refractive error. Refractive error is where one or both of a child's eyes are unable to bring parallel rays of light to focus on the retina. The three main types of refractive error are: myopia (short-sightedness),hyperopia (long-sightedness) and astigmatism.In children, significant levels of refractive error may result in blurred near vision and/or blurred distance vision. Children may also suffer from strained or sore eyes, headaches, watery eyes and screwing up
of the eyes. It is normal during the first few years of life for changes to occur in a child's eyesight. Most newborn babies are long-sighted but as they grow this typically decreases to the point where by around schoolage or early adolescence they have minimal or no refractive error. However if this process does not happen normally then permanent refractive errors such as short- or long-sightedness can develop.