Hemenger R P
Southern California College of Optometry, Fullerton 92831, USA.
J Am Optom Assoc. 1996 Oct;67(10):606-9.
The superposition of thin sphero-cylindrical lenses with arbitrary angles between cylindrical axes is sometimes required in a clinical setting. For example, it may be useful in some instances to perform an overrefraction which, added to the spectacle or toric contact lens in place on the eye, yields a final correcting lens.
Computer calculations have been used to create contour graphs allowing a graphical solution to the problem of combining sphero-cylindrical lenses. Although conceptually strightforward, the method has not been presented before.
The use of contour graphs to superpose sphero-cylindrical lenses is shown by examples to be accurate and much simpler than calculational methods.
Lacking a pre-programmed computer, the method of contour graphs offers a practical method of combining sphero-cylindrical lenses.
在临床环境中，有时需要叠加柱面轴之间具有任意角度的薄球柱面透镜。例如，在某些情况下，进行验光复验可能会很有用，将复验结果与眼睛上佩戴的眼镜或复曲面隐形眼镜相加，即可得到最终的矫正镜片。
已使用计算机计算来创建等高线图，从而以图形方式解决组合球柱面透镜的问题。尽管该方法在概念上很简单，但此前尚未有过相关介绍。
通过示例表明，使用等高线图叠加球柱面透镜既准确又比计算方法简单得多。
在没有预编程计算机的情况下，等高线图法提供了一种组合球柱面透镜的实用方法。
