| 摘要 |
A double progressive spectacle lens is described. The invention is distinguished in that at least one of the two progressive surfaces has at least one of the following properties: principal line of sight a) the profile of the surface power along the principal line of sight in the progression channel is not monotonic between y=-15 mm and y=+10 mm, b) the profile of the surface astigmatism along the principal line of sight has at least two clearly expressed maxima that are at least 0.175 dpt above an adjacent minimum, c) the surface astigmatism A deviates in absolute terms by more than dA upward or downward from the prescription value A<SUB>R </SUB>of the cylinder at approximately all points along the principal line of sight, d) the surface astigmatism has a global maximum on or in the vicinity of the principal line of sight between y=±20 mm, e) the surface astigmatism has a local maximum on or in the vicinity of the principal line of sight between y=±20 mm, f) 85% of the change in the surface power along the principal line of sight is reached on each of the surfaces on a path of less than 11 mm, g) the channel width at 0.75 dpt has at least two minima in the progression channel between y=+10 mm and y=-18 mm, distance zone h) the surface astigmatism A deviates in the distance zone by more than dA upward or downward from the prescription value A<SUB>R </SUB>of the cylinder at approximately all points: <?in-line-formulae description="In-line Formulae" end="lead"?>|A-A<SUB>R</SUB>|>=dA, with dA>=0.18 dpt <?in-line-formulae description="In-line Formulae" end="tail"?> i) the surface astigmatism A deviates in the distance zone by more than dA upward or downward from the prescription value A<SUB>R </SUB>of the cylinder at at least one point: <?in-line-formulae description="In-line Formulae" end="lead"?>|A-A<SUB>R</SUB>|>=dA, with dA>=0.5 dpt <?in-line-formulae description="In-line Formulae" end="tail"?> near zone j) the surface astigmatism A deviates in the near zone by more than dA upward or downward from the prescription value A<SUB>R </SUB>of the cylinder at approximately all points: <?in-line-formulae description="In-line Formulae" end="lead"?>|A-A<SUB>R</SUB>|>=dA, with dA>=0.22 dpt <?in-line-formulae description="In-line Formulae" end="tail"?> k) the surface astigmatism A deviates in the near zone by more than dA upward or downward from the prescription value A<SUB>R </SUB>of the cylinder at at least one point: <?in-line-formulae description="In-line Formulae" end="lead"?>|A-A<SUB>R</SUB>|>=dA, with dA>=0.4 dpt. <?in-line-formulae description="In-line Formulae" end="tail"?>
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