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间接眼底镜是观察眼底的器械,而眼底照相机可以将眼底图象记录下来。在此基础上,又发展了电视显示式间接眼底镜和电视显示式眼底照相机。这样,又带来了电视所具有的优点:(1)可供许多人同时观察眼底,便于会诊和示教;(2)可以连续地记录眼底图象。然而,这类器械的电视装置只是附接于间接眼底镜上或眼底照相机上,因此不可避免地带来一些缺点:(1)由于要避免光学上的象差,只得将瞳孔中心或近中心处的小区域用作眼底观察,而其余大区域作眼底照明用。因此,光接收效率低而需要高强度的照明,以致病人有不适感;(2)眼底在空间形成光学象,从而象质受象差的影响。这里介绍一种由美国视网膜基金会眼科研究院研制
Indirect ophthalmoscopy is the observation of fundus instruments, and fundus camera can record the fundus images. On this basis, we have also developed the television display indirect fundus and television display fundus camera. In this way, television brings the following advantages: (1) It can be used by many people to observe the fundus at the same time for consultation and teaching; (2) The fundus image can be continuously recorded. However, television devices for such devices are attached only to indirect ophthalmoscopes or fundus cameras and therefore inevitably bring about some disadvantages: (1) since optical aberrations are to be avoided, only the center of the pupil at or near the center Small area for fundus observation, while the remaining large area for fundus lighting. Therefore, the light receiving efficiency is low and high intensity lighting is required so that the patient has discomfort; (2) the fundus forms an optical image in the space, whereby the image quality is affected by the aberration. Here is a description by the American Academy of Retina Eye Institute developed