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用主觉检查法检查散光时,交叉圆柱镜是常用的一个工具。由于交叉圆柱镜构造的特点,它在一个轴位上增加一定镜片度数的同时,在与其垂直的另一轴位上减少同样的度数。在患者为混合散光或有
Check the astigmatism with the main test method, the cross-cylinder is a commonly used tool. Due to the characteristics of the cross-cylindrical structure, it increases the number of lenses in one axis while reducing the same degree in the other axis perpendicular to it. In patients with mixed astigmatism or have