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目前,临床上近视力检查是在自然光线下,以目测距离确定被检查者与标准近视力表之间的距离,来检测近视力。由于目测距离的不准确性和自然光线的可变性,使得检测结果不准确。有时被检查者能辨清小视标而具有老视或远视的检测者却不能辨清其方向,特别在大批量体检中,医务人员长时间注视小视标,易引起眼睛疲劳。为克服以上不足,我们设计了一种近视力检查仪,它能方便地进行近视力检查,确定距离方便,准确,不受环境光线影响,医务人员能轻松地判断出所指示的视标方向,还可适用于测量近点。1 结构(见图)
At present, the near vision test in clinical practice is to detect near vision with a visual distance to determine the distance between the examinee and the standard near vision chart under natural light. Due to the inaccuracy of the visual distance and the variability of natural light, the detection result is inaccurate. Occasionally, examiners who can discriminate small optotypes and have presbyopia or farsightedness cannot clearly discern their direction. In particular, in large-volume medical examinations, medical personnel may stare at small optotypes for a long time, which may cause eye strain. In order to overcome these deficiencies, we have designed a near vision inspection device that can easily perform near vision inspection, determine the distance is convenient and accurate, and is not affected by ambient light. Medical personnel can easily determine the direction of the indicated visual target. Suitable for measuring near points. 1 Structure (see figure)