作者自1970年以来,对300多例患者应用了此种三棱镜,认为此镜重量轻,外观不显,价格低,可根据患者的需要,随时可更换,优于以往三棱镜。其缺点为视力有减退,需要适当的应用和清洗,有些孩子不满于从三棱镜中观看,其次时间长后,三棱镜变黄,尤其吸烟患者。 Since 1970, the author has applied such a prism to more than 300 patients, believing that the lens is light, invisible and inexpensive, and can be readily replaced at any time according to the patient’s needs. The disadvantage is the vision loss, need appropriate application and cleaning, some children dissatisfied with viewing from the prism, followed by a long time, the prisms turn yellow, especially in patients with smoking.