By measuring the changes in the curvature of the eye caused by a build-up of internal pressure, Sensimed's Triggerfish lens can build up a much more accurate profile.
At last, the author obtained the equation of ray trace in the GRIN ball lens with the index profile which is quadratic and drew some important conclusions.
研究了二次抛物线型的GRIN球透镜的光线轨迹方程序；得出其轨迹为椭圆曲线及一些重要结论。
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This paper describes accurate surface profile measurement of an aspherical lens on an ultra-precision grinding machine using the error separation technique.