Examination instrument

摘要

Light from an exit pupil of an illumination unit is directed to a beam splitter which directs the light to an objective. The retina is illuminated, if a real image of the exit pupil of the illumination unit and a real image of an entrance pupil of a camera unit are formable in a position ranging from the cornea to the backside of the crystalline lens with the light. The objective forms a real intermediate image of the retina between the objective and the camera unit. The beam splitter directs the light from the retina to the camera unit, while causing the path of the illumination and the path of the imaging to deviate for non-overlapping images of the exit pupil and the entrance pupil in the crystalline lens. A relay lens system forms a real image of the intermediate image on a detecting component with the light reflected from the retina for transforming the image into an electric form to be shown on a screen.

主权项

1. An apparatus for imaging an eye, comprising:
an illumination unit; a beam splitter; an objective; a relay lens system; a fixation target unit; and a camera unit, the illumination unit comprising an optical radiation source, the illumination unit being configured to direct optical radiation of the source from an exit pupil of the illumination unit to the beam splitter, the beam splitter being configured to direct the optical radiation to the objective for illuminating the retina of an eye, the fixation target unit being configured to illuminate the retina of the eye with at least one fixation target image with visible optical radiation; the objective being configured to form a real intermediate image of the retina between the objective and the camera unit with the optical radiation reflected from the retina, wherein a real image of the exit pupil of the illumination unit and a real image of an entrance pupil of the camera unit are formable in the position ranging from the cornea to the backside of the crystalline lens of an eye, the beam splitter residing between the objective and the aperture of the relay lens system and being configured to direct the optical radiation from the retina to the camera unit, the beam splitter being configured to deviate the path of the illumination radiation and the path of the imaging radiation in a predetermined manner for preventing an overlap of the images of the exit pupil and the entrance pupil at least in the crystalline lens, and the camera unit comprising a detecting component, the relay lens system being configured to form a real image of the intermediate image on the detecting component with the optical radiation reflected from the retina for the optical image to be shown.