METHOD, USE OF ADAPTED OPTOTYPES AND DEVICE FOR DETERMINING VISUAL ACUITY CHARACTERISTICS OF A SUBJECT

Abstract

A method for determining acuity-of-vision characteristics of a test person with a astigmatic visual defect, including: providing visual defect data for the test person, wherein the visual defect data includes a cylinder axis or axial position of a required optical cylinder correction; selecting a preferential direction such that this preferential direction either corresponds to the cylinder axis which is assigned to the optical cylinder correction, is rotated by 90° to this cylinder axis, or is derived from wavefront data using a point spread function; applying an optical power in the selected preferential direction; displaying an adapted visual sign, which has a directional feature, wherein the adapted visual sign is displayed aligned such that its directional feature is parallel to the preferential direction; and determining acuity-of-vision characteristics of the test person for the selected preferential direction, taking into account a dimension of the directional feature and the applied optical power.

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