Magnifying glass having a variable focus, variable...

G - Physics – 02 – C

Patent

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G02C 7/08 (2006.01)

Patent

CA 2175665

The invention relates to a magnifying vision aid for use as magnifying spectacles. The magnifying spectacles in accordance with the invention have an automatic and/ or a manual focusing device, a device for manually altering the magnification factor and a device for automatic parallax compensation corresponding to the current focal lenath. If, for instance during a vascular surgical operation, an alteration of the working distance is necessary due to the position of the different operation sites, the vision aid in accordance with the invention takes account of this requirement by the possibility of automatic or manual adaptation of the focal length and the automatic adaptation of the parallax angle. An optimum optical configuration, which always corresponds to the action which is being performed, can thus be ensured and a substantially less fatiguing operation than previously can be rendered possible by the selection of the most advantageous ergonomic position. Furthermore, the vision aid in accordance with the invention offers the possibility of matching the magnification factor to requirements at every selected working distance.

L'invention concerne un auxiliaire visuel grossissant destiné à être utilisé comme lunette à verre grossissant. La lunette à verre grossissant selon l'invention présente un dispositif de focalisation automatique et/ou manuel, un dispositif permettant de faire varier manuellement le rapport d'agrandissement, ainsi qu'un dispositif de correction automatique de parallaxe correspondant à la distance focale respective. Si, par exemple, durant une intervention chirurgicale vasculaire, la distance de travail doit être changée par suite de la situation des divers emplacements d'opération, l'auxiliaire visuel tient compte de cette exigence, du fait de la possibilité d'adaptation automatique ou manuelle de la distance focale et de la correction automatique de l'angle de parallaxe. Il s'ensuit qu'une configuration optique optimale correspondant à chaque intervention particulière à effectuer est toujours assurée et qu'il est possible d'opérer avec beaucoup moins de fatigue qu'avec les moyens connus jusqu'à present, du fait que la position ergonomique la plus avantageuse peut être choisie dans chaque cas. En outre, l'auxiliaire visuel selon l'invention offre la possibilité d'adapter le rapport d'agrandissement à chaque exigence particulière, pour toute distance de travail choisie.

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