Device and method for the quantitative detection of disorders in the field of vision

A device for the quantitative detection and/or monitoring of disorders in the field of vision of an eye of a subject comprising:

• a display device;
• at least one control device for the display device and at least one processor and at least one storage device, wherein the device projects to the display device a square reticule consisting of a plurality of parallel equidistant horizontal lines and a plurality of equidistant parallel vertical lines with defined spacing and an essentially centrally arranged focus point, wherein each individual line of the square reticule can be changed into a curve by at least one input signal which is suitable to transform the nonlinear square reticule perceived by the subject as curved due to the disorder in the field of vision into the original square reticule again, wherein
• the boundary lines of each field of the square reticule is defined by boundary functions, which in an initial state are each displayed as lines so that the individual fields are geometrically present as squares and are displayed as such by the display device, but are in part perceived as curved by subjects with disorders in the field of vision;
• and
• the boundary lines which are perceived as curved can be modified by a series of input signals which modify the boundary curves defined by the boundary functions—and not only the intersection points of the vertical and horizontal lines in the reticule—in such a way that the original linear reticule can be perceived,
• wherein
• the geometric deviations caused by transformation of the regions of the square reticule perceived as curved from the originally present squares are determined quantitatively as the sum of the horizontal deviations and as the sum of the absolute values of the vertical deviations,
• wherein the boundary functions are selected from the group consisting of:
• splines, B-splines, non-uniform rational B-splines, cubic splines, Bézier curves, quadratic, cubic or mixed-rational Bézier curves;
• Bernstein polynomials;
• polynomials equal to or greater 2nd degree;
• polygon chains;
• polygon chains calculated using the De-Casteljau algorithm;
• other algebraic curves, in particular potency, root, rational and mixed-rational, transcendental functions, in particular exponential, logarithmic, trigonometric, hyperbolic, arcus and area functions.