Focusing aid for fundus cameras and ophthalmoscopes based on the 'non mydriatic' - principle

摘要

The present invention relates to a device for the investigation of the fundus oculi by means of an optical system and electronic sensors for image recording, preferably a fundus camera.In the case of the inventive focusing aid for fundus cameras and ophthalmoscopes, based on the "non mydriatic" - principle, in the beam path for the observation and the image recording is pivotably arranged an additional lens, which are either during the observation with infrared light or during the recording of the image with visible light in the beam path and the compensating the different focusing planes.With the focusing aid, a solution is made available with which the different speed by a simple arrangement of the adhesion belt-shaped be effectively compensated. On account of the small dimensions of the compensation element is a rapid a - and out possible. In contrast to the "classical " over only a small amount of additional components are required, so that the solution is markedly simpler. In addition, advantageous properties of the observation system, such as, for example, the telecentric, for the image obtained.