Hitzenberger C K
Institut für Medizinische Physik, Universität Wien, Vienna, Austria.
Invest Ophthalmol Vis Sci. 1991 Mar;32(3):616-24.
A new technique has been developed to determine the axial length of the human eye in vivo. Based on laser interferometry in conjunction with the Doppler technique, it uses partially coherent light. This new technique complies with laser safety regulations. High accuracy is achieved, the optical length (OL) can be determined within +/- 30 microns, and the reproducibility of the geometric eye length is greater than +/- 25 microns. Possible errors are discussed. First comparisons with the ultrasound technique yield good agreement for emmetropic subjects and for subjects with a myopia of up to 10 diopters. The advantages of the laser doppler interferometry (LDI) technique are high accuracy, high transversal resolution, and more comfort for the patient (it is a noncontact method; no anesthesia is needed). Possible future applications of LDI, like measurements of fundus profiles and of retinal thickness, are mentioned.
一种用于在活体中测定人眼眼轴长度的新技术已经被开发出来。基于激光干涉测量法与多普勒技术相结合，它使用部分相干光。这种新技术符合激光安全规定。该技术具有高精度，光学长度（OL）可在±30微米范围内测定，眼球几何长度的可重复性大于±25微米。文中讨论了可能出现的误差。首次将其与超声技术进行比较，结果显示对于正视眼受试者以及近视度数高达10屈光度的受试者，二者吻合度良好。激光多普勒干涉测量法（LDI）技术的优点是精度高、横向分辨率高，并且对患者来说更舒适（它是一种非接触式方法；无需麻醉）。文中还提到了LDI未来可能的应用，如眼底轮廓测量和视网膜厚度测量。
