Carl Zeiss Meditec Ag

Carl Zeiss Jena Gmbh

Lothar Mueller

Roland Bergner

Klaus-Ditmar Voigt

Dietmar Steinmetz

Roland Barth

Axel Doering

Frank Behrendt

Burkhard Dietzel

Siegfried Schubert

Marco Hanft

Ingo Koschmieder

Detlef Biernat

Uwe Lippmann

Manfred Dick

Jan Buchheister

Frank Teige

Reinhard Ruedel

Ergon Luther

Combined equipment for non-contacting determination of axial length (AL), anterior chamber depth (VKT) and corneal curvature (HHK) of the eye, are also important for the selection of the intraocular lens IOL to be implanted, particularly the selection of an intraocular lens (IOL) to be implanted, preferably with fixation of the eye by means of a fixating lamp and/or illumination through light sources grouped eccentrically about the observation axis.

System and method for the non-contacting measurements of the eye

The invention is directed to an optical system for a fundus camera for reflection-free opthalmoscopy having a beam path with refractive and reflective optical elements which are used substantially in common for illumination and observation or recording. An imaging mirror system substantially comprising a plurality of reflecting optical elements in the form of mirrors and is provided for illuminating and imaging the fundus. At least one optical element, for example, mirror, is formed as a freeform mirror with an imaging, reflecting freeform surface. The optical elements are arranged in a housing in a precisely defined position and attitude relative to one another in such a way that an imaging of the reflecting surfaces of the optical elements on the image of the imaged retina is prevented within a wide diopter range of the patient's eye to be examined.

Optical system for a fundus camera

The invention is directed to an optical system for a fundus camera in which lens pairs are tilted relative to the imaging beam path to prevent flare. This tilting is carried out in two planes and these planes are preferably oriented perpendicular to one another.

The invention relates to a device for observing the ocular fundus, in particular to a fundus camera. Said device comprises a light source () for the provision of illumination radiation, an illumination optical path for directing the illumination radiation onto the ocular fundus and observation optics for reproducing the illuminated ocular fundus, the observation optics comprising a module (), whose refractive power can be electrically adjusted.

Focusing and astigmatism compensation device for a fundus camera

Combined equipment for non-contacting determination of axial length (AL), anterior chamber depth (VKT) and corneal curvature (HHK) of the eye are also important for the selection of the intraocular lens IOL to be implanted, particularly the selection of an intraocular lens IOL to be implanted, preferably with fixation of the eye by means of a fixating lamp and/or illumination through light sources grouped eccentrically about the observation axis.

System and method for non-contacting measurement of the eye

A testing and calibrating device for optical eye length measurement devices comprising two plano-convex lenses which are arranged in the illumination beam path so as to be oppositely oriented. A neutral filter with a defined transmission is located between these two plano-convex lenses.

Testing and calibrating device for optical eye length measurement instruments

A convergence tube for stereomicroscopes in which both observation beam paths are inclined relative to one another at an angle of convergence &agr; and image inversion elements are provided in both observation beam paths. Four planar reflectors R,to R,are provided in each of the two beam paths and are arranged relative to one another in such a way that the axis beams incident on and emergent from the reflectors R,, R,lie in a common plane E,, the axis beams incident on and emergent from the reflector R,describe a plane E,that forms an angle &bgr;&equals;90&deg;&plus;&agr;/4 with the plane E,, and the axis beams incident on and emergent from the reflector R,describe a plane E,that forms an angle &bgr;,&equals;&agr;/2 with plane E,.

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Ottendorf, Germany

Lothar Mueller