A trichromatic test for spheric and astigmatic refraction.
An improved chromatic rotatable refraction test for simultaneous spheric and astigmatic refraction is described. Its new features are interposition of a bright yellow stripe between the conventional red and green fields and a pair of parallel test lines, which traverse vertically all colored fields. Thereby astigmatic errors become easily visible.
D001251:Astigmatism / Q000175:diagnosis*; D003119:Color Perception Tests; D006801:Humans; D008722:Methods; D012029:Refraction, Ocular; D014787:Vision Tests / Q000295:instrumentation