在研究IOL屈光度数计算公式的准确性和调整公式的计算值时，应考虑术后acd的变化及其相关因素。
ACD changes and relevant factors should be considered in studying the accuracy of IOL refraction formula and in adjusting the calculated data.
对绞车的工作特性进行分析，采用大林算法，设计了一种恒速度数字控制器，给出了控制模型和数学公式。
Analyzing the characteristic of the hoist, a kind of digital controller of constant speed is designed using Dahlin arithmetic, the model and formulas are presented.
结论：对于高度近视患者的人工晶体度数的计算，不仅要精确术前的生物测量、选择合适的计算公式，还需要根据患者不同的视力需求进行人工晶体度数的设计。
SRK-T formula had the best predictability. Conclusion: Accurate measurement data, suitable formula selection and the patient's need of visual function are important in myopia IOL calculation.
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