Schelenz J, Kammann J
Department of Ophthalmology, St. Johannes Hospital, Dortmund, West Germany.
J Cataract Refract Surg. 1989 Jul;15(4):425-8. doi: 10.1016/s0886-3350(89)80062-8.
The contact technique for ultrasound biometry was compared to the immersion technique. One hundred eyes were measured by both methods. Two groups were created based upon the axial length measurement: a group of 46 short eyes (axial length less than 23.3 mm) and a group of 54 long eyes (axial length greater than 23.3 mm). In each group the different types of measurement influenced the results obtained for the anterior chamber depth and the axial length of these eyes such that the contact technique yielded shorter measuring values than the immersion technique. In considering both methods, the difference in the anterior chamber depth and the axial length was smaller in the first group. Shorter measurements produced stronger intraocular lens power, which is equivalent to the axial length shortening by using the contact technique. The effect on the implant power calculation and the postoperative deviation of the pseudophakos refraction is shown by comparing the theoretical formula with the SRK formula. This prospective study describes the greater range of refractive pseudophakos deviation when using the contact method.
将超声生物测量的接触技术与浸入技术进行了比较。两种方法都测量了100只眼睛。根据眼轴长度测量结果分为两组：一组46只短眼（眼轴长度小于23.3mm）和一组54只长眼（眼轴长度大于23.3mm）。在每组中，不同的测量类型影响了这些眼睛前房深度和眼轴长度的测量结果，使得接触技术得出的测量值比浸入技术短。综合考虑两种方法，第一组前房深度和眼轴长度的差异较小。较短的测量值产生更强的人工晶状体屈光力，这相当于使用接触技术时眼轴长度缩短。通过将理论公式与SRK公式进行比较，显示了对植入物屈光力计算和假晶状体屈光术后偏差的影响。这项前瞻性研究描述了使用接触法时屈光性假晶状体偏差的更大范围。
