Method for checking the accuracy of the focus positioning of a laser device configured for emitting pulsed focused laser radiation, with the focus position thereof being adjustable both in the propagation direction of the laser radiation and also transversely to said propagation direction, wherein the laser device has a contact element which is transparent to the laser radiation and has a placement surface for placement of an object to be processed, wherein the method comprises the steps of: - placing a test object that is transparent to the laser radiation at least in one processing region against the placement surface, - radiating the laser radiation into the test object lying against the placement surface and, in the process, moving the focus position in accordance with a specified test pattern to produce permanent processing structures (44, 46, 50, 52) in the test object, characterized in that the processing structures comprise at least one first colouration structure (44, 52) that contrasts visually with surrounding material regions of the test object and that rises in the test object along a structure extent direction, which extends transversely, in particular rectilinearly at an angle, to the propagation direction of the laser radiation, up to an outer surface of the test object facing the placement surface, in that the processing structures furthermore comprise a second colouration structure that contrasts visually with surrounding material regions of the test object and forms one or more reference markings for marking a target penetration region of the first colouration structure through the outer surface of the test object, and in that a check is performed as to whether the first colouration structure (44, 52) penetrates the outer surface of the test object inside or outside of the target penetration region. - placing a test object that is transparent to the laser radiation at least in one processing region against the placement surface, - radiating the laser radiation into the test object lying against the placement surface and, in the process, moving the focus position in accordance with a specified test pattern to produce permanent processing structures (44, 46, 50, 52) in the test object, characterized in that the processing structures comprise at least one first colouration structure (44, 52) that contrasts visually with surrounding material regions of the test object and that rises in the test object along a structure extent direction, which extends transversely, in particular rectilinearly at an angle, to the propagation direction of the laser radiation, up to an outer surface of the test object facing the placement surface, in that the processing structures furthermore comprise a second colouration structure that contrasts visually with surrounding material regions of the test object and forms one or more reference markings for marking a target penetration region of the first colouration structure through the outer surface of the test object, and in that a check is performed as to whether the first colouration structure (44, 52) penetrates the outer surface of the test object inside or outside of the target penetration region.