(四) 我们前面已讲过,儿童视力随着年龄增长而发育。根据其发展规律,小儿出生头几年存在生理性远视(一般不超过300度),随着眼球发育,眼轴变长,大部分孩子变成正视,也有少部分因眼轴过长而成为近视。那么怎样辨别孩子是远视、近视还是正视呢?首先得了解眼内结构和成像原理。人眼能看清物体,感受光觉,主要眼内存在透光和屈光系统,光线到达眼底视网膜前要经过角膜、房水、晶状体、玻璃体,医学上统称为屈光间质。它与照 (D) As we said earlier, children’s visual acuity develops with age. According to its law of development, the first few years of life in children with physiological hyperopia (usually not more than 300 degrees), with the development of the eye, the axial length of the eye, most children become face up, but also because of the small part of the axial length of myopia . So how to identify the child is hyperopia, myopia or face it? First of all have to understand the structure and imaging of the eye principle. The human eye can see objects, feel light, there are light and refraction of the main eye system, the light before reaching the retina through the cornea, aqueous humor, lens, vitreous, medically known as refractive interstitial. It with photos