| 摘要 |
<p>In a device for measuring the refractive properties of spectacle lenses, a projection lens system projects the light of a light source through a field diaphragm bearing a measurement figure and through the spectacle lens arranged on a glass support on to a light receiving means, and the refractive properties are determined from the locus of the measurement picture in the lateral and/or longitudinal directions. The device is characterised by the combination of the following features: (a) the vergence of the light beam on the side of the spectacle lens facing the subject can be modified between a position in which the refractive properties for subject distance are detected to infinity and at least one position in which the refractive properties are detected for finite subject distances; (b) the glass support (4) is fixed and designed in such a way that the spectacle lens (5) can be lifted and tilted in the ray path in a defined manner and (c) a dioptric and/or prismatic compensation (42, 43) for tilted spectacle lenses adapted to a determined dioptometric range can be introduced into the ray path. One can thus determine precisely the close-up effect of spectacle lenses.</p> |
