Patent ID: 6935744

Claim:
A bi-aspherical type progressive-power lens with a progressive refractive power action dividedly allotted to a first refractive surface being an object side surface and a second refractive surface being an eyeball side surface, wherein when on said first refractive surface, a surface refractive power in a horizontal direction and a surface refractive power in a vertical direction, at a far vision diopter measurement position F 1 , are DHf and DVf respectively, and on said first refractive surface, a surface refractive power in a horizontal direction and a surface refractive power in a vertical direction, at a near vision diopter measurement position N 1 , are DHn and DVn respectively, relational equations, DHf+DHn<Dvf+DVn , and DHn<DVn are satisfied, and surface astigmatism components at F 1 and N 1 of said first refractive surface are cancelled by said second refractive surface so that said first and second refractive surfaces together provide a far vision diopter (Df) and an addition diopter (ADD) based on prescription values.