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[Music] which is better one or two now which is better three or four [Music] subjective refraction the procedure of using responses from the patient to determine the refractive correction for the eye trial and error or alternate choice techniques are applied in a step by step process with those patients old enough and cooperative enough to respond to arrive at the best optical correction in the 19th century subjective refraction was often performed with rotating discs of spherical lenses for the correction of myopia hyperopia or presbyopia astigmatism was more complicated to correct however and a stigmatic dial targets were devised first to locate the axis of astigmatism and then to balance the refractive correction in the two principal meridians the a stigmatic dials are still used by some refraction estate difficult for patients to understand in 1887 Edward Jackson described a fixed power Stokes lens that hed recently added to his case of trial lenses this a stigmatic lens used to r