| 摘要 |
The invention concerns a magnifying visual aid to be used as a magnifying glass. The magnifying glass according to the invention comprises an automatic and/or manual focusing arrangement, a device for manually adjusting the enlargement ratio and a device for automatic parallax correction according to the respective focal distance. If, during vascular surgery, for example, the working distance has to be changed owing to the situation of the various operating sites, the visual aid according to the invention takes account of this requirement owing to the possibility of automatic or manual adjustment of the focal distance and of automatic correction of the parallax angle. Consequently, an optimum optical configuration corresponding to each particular operation being performed is always ensured and, since the most advantageous ergonomic position can be selected in each case, it is possible to operate in a considerably less tiring manner than hitherto. Furthermore, the visual aid according to the invention enables the enlargement ratio at any selected working distance to be adapted to the particular requirements.
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