Berneaud-Kötz G
Klin Monbl Augenheilkd. 1988 Jun;192(6):717-9. doi: 10.1055/s-2008-1050211.
In this article the author describes a rare trial frame case in the medical history collection of the Ruhr University at Bochum. It has 24 binocular trial lenses which are similar to be early "Nuremberg wire spectacles." The lens power is expressed as the focal length, measured in Rhenish inches. Converted into diopters, the refractive power of the lenses ranges from +/- 1.0 to +/- 8.0 D.spherical. The case also contains six pairs of plane lenses tinted in various intensities of azure blue and four pairs of plane lenses tinted smoke-gray. It contains no astigmatic lenses. Since the metric system, with the diopter as a unit of refractive power, was introduced in the optical industry in 1875, it may be assumed that this case was in use before then. However, the design of the binocular trial frames suggests that they may be considerably older.
在本文中，作者描述了波鸿鲁尔大学医学史收藏中的一个罕见的验光架病例。它有24个双目试验镜片，类似于早期的“纽伦堡金属丝眼镜”。镜片度数用焦距表示，以莱茵英寸为单位。换算成屈光度后，镜片的屈光力范围为+/- 1.0至+/- 8.0 D（球镜）。该病例还包含六副不同深浅天蓝色的平面镜片和四副烟灰色的平面镜片。其中没有散光镜片。由于以屈光度作为屈光力单位的公制系统于1875年被引入光学行业，因此可以推测这个病例在此之前就已使用。然而，双目验光架的设计表明它们可能要古老得多。
