PROGRESSIVE-POWER LENS AND METHOD FOR DESIGNING PROGRESSIVE-POWER LENS

摘要

There is provided a progressive addition lens, including: a distance portion and a near portion; an object side surface including a first toric surface element; and an eyeball side surface including a second toric surface element that cancels the first toric surface element, wherein the first toric surface element is the element in which a vertical surface power OVPf 1 at a distance reference point which is previously defined in the distance portion on the object side surface, is larger than a horizontal surface power OHPf 1 at the distance reference point, and OVPf 1 is not less than a vertical surface power OVPn 1 at a near reference point which is previously defined in the near potion on the object side surface.