Buckley John G
Optom Vis Sci. 2010 Jan;87(1):66-9. doi: 10.1097/OPX.0b013e3181c3837a.
A new method of measuring lens refractive index requiring immersion in solution and measuring lens power in air and in solution is extended. Prompted by a clinical need, the new method using lens power can be extended by applying it to prismatic power as well. This article provides a theoretical basis explaining why this can be done.
The prismatic power of a prism is derived from first principles. Snell's Law and geometrical optics provide the framework for demonstrating the validity of the resulting formula.
The sameness in formula derived using lens power or prism is shown, both from a paraxial and non-paraxial optics perspective. The effect of varying lens material and amount of prism is considered.
The prismatic method described provides a useful alternative method of determining the refractive index of any lens. In some cases, it may be the only method available. Practitioners should consider when each method will provide optimal results.
一种测量晶状体折射率的新方法得到了扩展，该方法需要将晶状体浸入溶液中，并测量其在空气中和溶液中的屈光力。受临床需求的推动，利用晶状体屈光力的新方法也可以应用于棱镜屈光力。本文提供了一个理论基础来解释为何可以这样做。
从基本原理推导棱镜的屈光力。斯涅尔定律和几何光学为证明所得公式的有效性提供了框架。
从傍轴和非傍轴光学角度，展示了使用晶状体屈光力或棱镜推导的公式的一致性。考虑了晶状体材料变化和棱镜量的影响。
所描述的棱镜方法为确定任何晶状体的折射率提供了一种有用的替代方法。在某些情况下，它可能是唯一可用的方法。从业者应考虑每种方法何时能提供最佳结果。
