The optical system for determining the variation of curvature of an object on a zone of small dimensions.

摘要

The optical system comprises:… - a light source (1);… - a first lens (3) intended to produce a parallel light beam (2b) from the beam (2a);… - a semi-reflecting element (4) placed in the path of the said parallel beam (2b);… - a second focusing lens (7), which receives the parallel beam (2c) reflected by the said element (4) and which can be moved parallel to the direction of propagation of the said light beam (2c) so that its image focus (8) coincides with the centre of curvature (C) or the surface of the said object (9);… - a third focusing lens (10), which receives the beam (2d) reflected by the object (9) and coming from the said element (4), and… - a means (11) for detecting the image (12) formed by the said system. …??Application to keratometry. …IMAGE…