【摘要】 <正> 人工晶体(artificial lens),又称假晶体(pseudophakos)或眼内透镜(intra-ocular lens)。由于它是安装于眼球内部的,所以不能象普通眼镜或角膜触镜一样,一旦发现折射力不适合便可随时调换,而必须在手术前准确地计算出其折射力。更多还原

【Abstract】 This article studied the problems on the calculation of the power of an artificial lens The author cleared up the datums necessary for the eal- cnlation of the power of an artificial lens and the methods to determine them.Four kinds of the powers,that is,emmetropizing power,power ma- k ing the eye slightly myopic,iseiconizing power and standard power, were put forward,and the method for the calculation of each power was introduced.To the calculation we can apply the formula% the tables,the diagrams and the slide rule.The reduced method,used to calculate the po- wer only knowing the eye refraction,was also introduced. The author points out that we must first of all adopt theiseiconizing power,and that we should adopt the emmetropizing power if the predict- ed difference of the size of the retinal image in both eyes is less than 5%. This article also discussed the influences of the changes of the radius of the corneal curvatnre (r),the axial length of the eye (l) and the depth of the anterior chamber (d) on the power of an artificial lens(D_L),the eye refraction(R)and the relative spectacle magnification (RSM).The most significant facfor to have the influencn on them(D_L,Rand RSM)is the change of the radius of the corneal curvature (r).Because the changes of those factors are all small,the calculation before the operation still has higher accuracy.更多还原