Patent ID: 9709821
Date: 2017-07-18
CPC Classifications: G02C

Claim:
1. A pair of progressive addition lenses comprising: a progressive addition lens for a left eye corresponding to the left eye of a lens wearer; and a progressive addition lens for a right eye corresponding to the right eye of the lens wearer, wherein a lens power of the progressive addition lens for the left eye and a lens power of the progressive addition lens for the right eye are set so that an accommodation power required for the left eye and an accommodation power required for the right eye coincide with each other, when an arbitrary point on a virtual object surface set previously is watched binocularly through the progressive addition lens for the left eye and the progressive addition lens for the right eye, the virtual object surface is configured so that a point on the virtual object surface gradually approaches from the distance vision zone corresponding to the infinite distance to the near vision zone in lower side on a median plane, and a point on the virtual object surface becomes a distant point gradually as it goes away in right and left directions from the median plane, when the virtual object surface is viewed from an eyeball side of the lens wearer, the accommodation power required for the left eye is calculated based on a distance from the left eye to the arbitrary point on the virtual object surface, and a lens power at a passing point when an optical ray from the left eye towards the arbitrary point on the virtual optical surface passes through the progressive addition lens for the left eye, and the accommodation power required for the right eye is calculated based on a distance from the right eye to the arbitrary point on the virtual object surface, and a lens power at a passing point when an optical ray from the right eye towards the arbitrary point on the virtual optical surface passes through the progressive addition lens for the right eye.