Patent ID: 9247871
Filing Date: 2016-02-02
CPC Classification: A61B

Claim Text:
1. A non-transitory tangible medium configured for programming a processor to produce on a display 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 within a range that includes a resolution limit width (hereinafter “RLW”) of a test subject visual acuity, and an adjustable length dimension that is initially set within said range that includes said RLW of the test subject visual acuity and is adjustable to other values; (b) a base, comprising one or more further lines including at least one of said one or more further lines approximately intersecting said at least one line, wherein a number of said one or more further lines is adjustable; (c) wherein the base comprises a round, elliptical, circular, semi-circular, oval, square, rectangular, hexagonal, octagonal or other polygonal, or curved regular or irregular shape; and (d) wherein each of one or more of color, brightness, or gray level of the at least one line or of the one or more further lines, or both, is adjustable; and (e) wherein the one or more of the color, brightness, or the gray level of the background within which the viewing target is displayed is also adjustable; and (f) wherein at least one line of the viewing target changes position in angular increments by appearing at a first position for a temporal duration selectable between 0.01 seconds and 2 seconds, and then disappearing from the first position and appearing at a second position that is displaced from the first position by an angular increment; and (g) wherein the angular increments are selectable between 2 degrees and 45 degrees, and (h) wherein the processor is further programmed to adjust sphere and cylinder values, while the test subject is looking at the viewing target through selected optics of sphere and cylinder.