Patent ID: 8172396
Filing Date: 2012-05-08
Classification: G02C

Abstract:
1. A bifocal lens for eyeglasses constituted of a single material with a uniform refractive index and provided with a presbyopia lens part used for looking at something near and a portion of a body lens part used for looking at something at a distance, wherein said presbyopia lens part is formed of an upper side which is generally horizontal when used, a lateral side of an ear which continues to said upper side and expands toward the ear, and a lower side parallel to the peripheral shape of the lower side of an eyeglass so as to have a generally circular-arc shape or a generally rectangular shape as a whole, and said upper side and said lateral side form a generally straight boundary line which is recognizable by a user, wherein a contact point of said upper side and said lateral side is positioned to be shifted towards the ear side from an apex of warpage of said body lens part.