Patent ID: 9581831
Date: 2017-02-28
CPC Classifications: G02C

Claim:
1. An optical lens comprising: an object-side surface including an atoric surface element; and an eyeball-side surface including an element that cancels a surface power shift produced by the atoric surface element, wherein the atoric surface element of the object-side surface causes horizontal surface power at a fitting point to be greater than vertical surface power at the fitting point, the fitting point being a point through which a line of sight of a primary position of a user who is horizontally viewing a distant object in front of the user passes, and the atoric surface element of the object-side surface (i) causes a difference between the horizontal surface power and the vertical surface power to decrease along a horizontal reference line passing through the fitting point in a direction from the fitting point toward a periphery of the optical lens or (ii) causes a sign of the difference between the horizontal surface power and the vertical surface power to change along the horizontal reference line.