作视网膜检影(即验光)时,当受检者眼的远点与检查者工作距离相一致即达“中和”,寻找中和点是检影正确的关键。据以往传统的描述,中和时所见受检者瞳孔区反射图像或为全亮,或为全暗,无运动现象。作者在多年检影实践中发现并非如此,而是既有亮有暗以亮为显,并有顺逆两种运动,以顺为显。为探求中和的真面貌,我们应用一般光学和数学原理,进行实验研究,结果表明, For retinoscopy (ie, optometry), when the distance between the examinee’s eye and the examiner’s work is consistent with the “neutralization”, looking for the point of neutralization is the key to correct retinoscopy. According to the traditional description of the past, when seen in the pupil area and reflect the image or for the whole light, or dark, no movement. The author found in many years of retinoscopy practice is not the case, but both the bright dark to the bright, and there are two types of exercise, Shun to show. In order to explore the true appearance of neutralization, we apply the general principles of optics and mathematics to conduct experimental studies. The results show that,