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    Refractive Mgmt/Intervention

    The relationship between the position of a cylindrical lens relative to the entrance pupil of a nonastigmatic eye and the distortion of the retinal image produced. A,, No distortion in the absence of the cylindrical lens. Meridional magnification. B, Distortion produced by the cylindrical lens located in the usual spectacle plane. C, No distortion when the cylindrical lens is placed hypothetically in the entrance pupil of the eye.