The present invention refers to the light ring target mire (8) used for accurate measuring of the radii of curvature of spherical and non spherical reflective surfaces, with a fixation target for the patient, holes that allow the observation by the slit lamp (7), holes to be illuminated (4), using an illumination system composed by a header which has an exit lens from the illumination system, focused filament, an intermediary circle and a light stop with an useful area for the target mire, being alternatively projected with arc shaped rings, or passing through rings in a precise circumlinear shape, allowing to be used with different types of illumination systems, providing measurements of any reflective surface, not being limited to ocular exams.
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