The diffractive optical elements(DOEs) used in imaging systems has many advantages, such as achromatization and thermal compensation besides the features of saving in mass and volume.

采用衍射光学元件除了能减小成像系统的体积和重量外 ，还具有许多传统光学元件无法比拟的优越性 ，如消色差和热补偿功能等。

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A dispersion correcting circuit of SLO is presented. The circuit can compensate achromatization produced by the acoustooptic deflector and enhance sharpness of the colour image for better diagnosis.

本文介绍了一种激光扫描检眼仪的消色散电路。该电路可补偿声光偏转器产生的色散，提高彩色图像的清晰度，增强该仪器的辅助诊断作用。

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