Medina A
Ophthalmologica. 1987;194(2-3):133-9. doi: 10.1159/000309750.
The response of a second-order feedback system is used to describe the controlling process that regulates the refraction of the human eye to achieve optimal visual acuity over the years (emmetropization). From data collected in past refractions, the equation of the feedback system has been derived for individual eyes and used to predict changes in their refraction with age with an accuracy of 0.50 diopters for 89.1% of the eyes tested. If the model is applied to other populations, the root mean square error of prediction will be between 0.20 and 0.36 diopters with a 95% degree of confidence. The model indicates that corrective lenses applied to the eyes, especially in the early years of life, will cheat the servo system and defeat the emmetropization process.
二阶反馈系统的响应被用于描述多年来调节人眼屈光以实现最佳视力（正视化）的控制过程。根据过去验光收集的数据，已推导出个体眼睛的反馈系统方程，并用于预测其屈光随年龄的变化，对于89.1%的受试眼睛，预测精度为0.50屈光度。如果将该模型应用于其他人群，在95%的置信度下，预测的均方根误差将在0.20至0.36屈光度之间。该模型表明，戴在眼睛上的矫正镜片，尤其是在生命早期，会欺骗伺服系统并破坏正视化过程。
