Accurate measurements of phase refractive index of soft contact lenses.
Accurate measurements of phase refractive index of soft contact lenses.
复制标题
准确测量软隐形眼镜的相位折射率。
作者：
Todd Szarlan;Donald S. Gibson;Xin Wei;F. Ignatovich
我们描述了一种测量水凝胶和硅水凝胶(软)接触镜体相折射率的方法，在多个波长下测量精度为+/-0.001，对变化的灵敏度为0.0002。该方法利用时域低相干干涉法，以10 nm为增量获得530~670 nm范围内隐形眼镜的群折射率。然后，测量的GRI色散曲线被数学地转换为位相折射率值。这种方法是基于使用聚焦光束的点测量，因此测量时不需要平坦化透镜。我们讨论了该方法对眼科光学制品制造中的质量控制的实际意义。
We describe a measurement approach for the bulk phase refractive index of hydrogel and silicone hydrogel (soft) contact lenses in solution at multiple wavelengths with an accuracy of +/- 0.001, and sensitivity to change of 0.0002. The method uses time-domain low-coherence interferometry to obtain group refractive index (GRI) for contact lenses between 530 to 670 nm in 10 nm increments. The measured GRI dispersion curve is then mathematically converted to the phase refractive index values. The approach is based on a point measurement using focused beam, and therefore does not require flattening of the lens for the measurements. We discuss practical implications of the method for the quality control in manufacturing of ophthalmic optics.