一、针孔镜片 在多数镜片箱内都配备若干个针孔镜片。它是一个中央有直径1nm圆孔的黑色金属(或塑胶)的特殊镜片。根据针孔成像的原理.它是用来增加物像在视网膜上的清晰度以提高视力的,对眼睛的屈光检查有一定帮助,主要用于初步判定患者视力减退是否与屈光不正有关。方法很简单:如遇到视力不正常的眼睛时,可以将针孔镜置于患眼之前(另眼遮挡),让患眼通过针孔再 First, the pinhole lenses in the majority of lens boxes are equipped with a number of pinhole lenses. It is a special black metal (or plastic) lens with a 1nm diameter hole in the center. According to the principle of pinhole imaging, it is used to increase the clarity of the retina on the image to improve eyesight, which can be helpful for the refractive examination of the eye. It is mainly used to determine whether the patient’s vision loss is related to refractive errors. The method is very simple: In case of abnormal vision of the eyes, the pinhole mirror can be placed in the affected eye (other obstruction), so that the eye through the pinhole and then