Patent ID: 8690323
Filing Date: 2014-04-08
Classification: G02C

Abstract:
1. A lens design standard selecting method to select a lens design standard from a basic design distribution group and a corridor length, the basic design distribution group determining a distribution of a distance vision area and a near vision area of a progressive addition lens pair, the method comprising: preparing lens design standard variations that include a plurality of basic design distribution groups different from each other in area-division between the distance vision area and the near vision area, and a plurality of corridor lengths different from each other; a parameter setting step of inputting parameters originating from at least: prescription information of a user who uses the progressive addition lens pair, life environmental information of the user, and frame shape information of a frame for holding the progressive addition lens pair; selecting a basic design distribution group from the plurality of basic design distribution groups based on the inputted parameters; selecting a corridor length from the plurality of corridor lengths based on the inputted parameters; and selecting a lens design standard which includes the basic design distribution group and the corridor length selected from the plurality of basic design distribution groups and the plurality of corridor length, respectively, from the lens design standard variations, wherein: in the parameter setting step, a distance between a vertex of a rear surface of a right progressive addition lens and a vertex of a cornea of a right eye and a distance between a vertex of a rear surface of a left progressive addition lens and a vertex of a cornea of a left eye calculated based on the prescription information of the user and the frame shape information in a state where spectacles worn by the user are included into setting elements of the parameters, at least one of the selecting the basic design distribution group, the selecting the corridor length, and the selecting the lens design standard is performed using a computing device, the selecting the basic design distribution group comprises: in the case where the user has been using spectacle lenses and where a last-used spectacle lens is a progressive addition lens,