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各种光学助视器如简单的不同放大倍数的手持或立式放大镜、眼镜式放大助视器、各种望远镜式助视器等,应用于低视力患者已有很长历史。但闭路电视助视器(Closed Circuit Television,CCTV)应用于低视力患者是始于本世纪50年代末期。电视作为传达信息的工具已有很久的历史,而闭路电视实际上在较长时间内未被人们注意,今后可能会成为低视力患者非常有利的助视器。用闭路电视作为助视器的研究工作的发展要首推在美国工作的Genensky及其同事们。闭路电视的基本结构是由电视摄像机及接收
A variety of optical aids such as simple magnification handheld or vertical magnifying glass, magnifying glasses magnifying glass, a variety of telescope-like visual aids, applied to patients with low vision has a long history. However, the application of Closed Circuit Television (CCTV) to patients with low vision began in the late 1950s. Television has long been a tool for transmitting information, and closed-circuit television has in fact been unnoticed for a long time and could become a very helpful visual aid for people with low vision in the future. The development of research using closed-circuit television as a visual aid de-emphasizes Genensky and colleagues working in the United States. The basic structure of CCTV is received by the TV camera