Jaeger W, Kratzer B
Klin Monbl Augenheilkd. 1976 Nov;169(5):656-9.
A magnification system newly developed by Zeiss on the basis of a Keplerian telescope permits, in connection with a direct-vision erecting prism, the design of stereoscopic surgical spectacles and thus a break into the microsurgical range. The magnification of 8.3X is just about the limit up to which muscular movement of the head is not disturbing, but on the other hand routine microsurgery, especially cataract and glaucoma surgery, is rendered possible.
蔡司公司在开普勒望远镜的基础上最新研发的放大系统，结合直视正像棱镜，可用于设计立体手术眼镜，从而进入显微外科领域。8.3倍的放大倍率刚好接近头部肌肉运动不会产生干扰的极限，另一方面，常规显微手术，尤其是白内障和青光眼手术也因此成为可能。
