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Single vision astigmatic cylindrical power spectacle lens
Single vision astigmatic cylindrical power spectacle lens
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机译：单视散光柱面镜
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摘要
A single-vision astigmatic-power spectacle lens 1 has cylindrical power to correct astigmatism of an eye. The spectacle lens has front 2 and back 3 surfaces, one of which is a rotationally-asymmetrical aspherical surface which has a first rotationally-asymmetrical component to add the cylindrical power for correcting astigmatism and a second rotationally-asymmetrical component to correct the aberrations in the directions between first and second principal meridians caused by adding the cylindrical power. That is, when the sag z(h, e) is expressed as a function of the angle e while fixing the distance h from the center, a curve of the function (see dotted line in Fig 3) has a larger gradient in close to the local maximum and a smaller gradient in close to the local minimum as compared with the curve interpolated by a sine curve (solid line in Fig 3).
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