Patel S
Am J Optom Physiol Opt. 1980 Oct;57(10):697-710. doi: 10.1097/00006324-198010000-00001.
Equations are presented for the theoretical determination of back vertex poser changes in soft contact lenses due to bending. The main assumption is that the volume of the lens remains unchanged. A description of changes in other lens parameters, namely, central thickness, overall diameter, and anterior radii, is presented for both spherical and toric lenses. In general, power changes predicted by the proposed model are less than those suggested by previous workers in this field. Changes however occur in other parameters which have previously been regarded as remaining constant such as the central thickness of the lens. These changes are of small degree but have significant bearing on back vertex power.
本文给出了用于理论确定软性接触镜因弯曲而导致后顶点屈光度变化的方程式。主要假设是镜片的体积保持不变。针对球面和复曲面镜片，给出了其他镜片参数（即中心厚度、总直径和前表面曲率半径）变化的描述。一般来说，所提出模型预测的屈光度变化小于该领域先前研究人员所提出的变化。然而，其他先前被认为保持不变的参数（如镜片的中心厚度）会发生变化。这些变化程度较小，但对后顶点屈光度有重大影响。
