Hillman J S
Trans Ophthalmol Soc U K (1962). 1985;104 ( Pt 7):693-8.
The postoperative refraction of the eye after intraocular lens (IOL) implantation is an important aspect of the quality of aphakia correction. The postoperative refraction cannot be guessed with consistent accuracy as the refractive power of an eye is multifactorial. Calculation of IOL power is based upon measurements of corneal curvature and axial length and an estimation of postoperative anterior chamber depth. There are a number of formulae available for the calculation of IOL power. The optical formulae, of which those of R. D. Binkhorst are the most popular, give results which are very similar and which all differ from the mathematical regression SRK formula by the indication of a stronger IOL power for short eyes. A statistical analysis of postoperative results confirms that the R. D. Binkhorst formula gives the author an over-powered IOL for short eyes when calculated for emmetropia but not when calculated for planned ametropia. Results with the R. D. Binkhorst formula will be improved by the modification of the anterior chamber depth according to the axial length. Both formulae give satisfactory results for the range of axial lengths commonly encountered in clinical practice. Whichever formula is used, it is important for each surgeon to analyse postoperative results and to modify the selection of IOL power according to this feedback to correct for consistent errors of instrumentation or technique.
人工晶状体（IOL）植入术后眼睛的屈光状态是无晶状体眼矫正质量的一个重要方面。由于眼睛的屈光力是多因素的，术后屈光状态无法始终准确地预估。人工晶状体屈光度的计算基于角膜曲率和眼轴长度的测量以及对术后前房深度的估计。有多种公式可用于计算人工晶状体的屈光度。光学公式中，R.D.宾克霍斯特公式最为常用，其计算结果非常相似，且与数学回归SRK公式的不同之处在于，对于短眼，该公式算出的人工晶状体屈光度更强。对术后结果的统计分析证实，当按照正视眼计算时，R.D.宾克霍斯特公式会使作者为短眼选择屈光度过高的人工晶状体，但按预期的屈光不正计算时则不会。根据眼轴长度调整前房深度后，R.D.宾克霍斯特公式的计算结果会得到改善。对于临床实践中常见的眼轴长度范围，这两种公式都能给出令人满意的结果。无论使用哪种公式，每位外科医生分析术后结果并根据反馈调整人工晶状体屈光度的选择以纠正仪器或技术上持续存在的误差都很重要。
