Patent ID: 8632183
Filing Date: 2014-01-21
Classification: A61B

Abstract:
1. A tangible medium displaying a viewing target for a visual acuity or a refraction measurement of a test subject, wherein the viewing target comprises: (a) at least one line comprising a width dimension that is below a resolution limit width (hereinafter “RLW”) of a test subject visual acuity, and an adjustable length dimension that is initially set at greater than the RLW of the test subject visual acuity and is adjustable to one or more reduced lengths including at or near the RLW of the test subject visual acuity; and (b) a base, comprising at least one or more further lines including at least one of said one or more further lines approximately intersecting the at least one line, wherein the viewing target includes an elliptical, circular, semi-circular, oval, square, rectangle, hexagon, octagon or other polygon, or a curved regular or irregular shape and the base having a thickness along the direction of the length of the at least one line that is greater than the RLW of the test subject visual acuity.