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各种近用助视器中,如眼镜式单透助视器,近用望远镜,立式放大镜,手持式放大镜及闭路电视等,以眼镜式单透镜被使用率为最高。可见该助视器具有较高的实用价值。放大率是助视器的三大主要参数(放大率、视野及工作距离)之一。传统的放大率公式M=F/4是表式某透镜的放大倍率与镜度关系,是相当重要的公式。但常常难予正确应用,容易被混淆。本文试行对这种助视器的放大率实用方法作出分析与探讨,以供临床工作及有关研究的参考。M=F/4公式的条件:该经典公式附有
A variety of near-vision aids, such as single-vision glasses aids, near telescopes, vertical magnifying glass, hand-held magnifying glass and closed-circuit television, etc., to glasses single lens was the highest utilization rate. Visible the visual aid has a high practical value. Magnification is a visual aid three major parameters (magnification, field of vision and working distance). The traditional magnification formula M = F / 4 is a form of lens magnification and mirror relationship, is a very important formula. But often difficult to correct application, easy to be confused. This article tries to analyze and discuss the practical method of magnifying power of this visual aid for reference of clinical work and related research. M = F / 4 Formula conditions: the classic formula attached