Patent ID: 8583406

Claim:
A visual simulator for a spectacle lens comprising: a lens design data acquirer that acquires lens design data on design items of a spectacle lens including a prescription for a spectacle wearer's naked eye; a lens designer that designs the spectacle lens based on the lens design data; an original image data acquirer that acquires an original image data; a frame data acquirer that acquires frame data including shape data and layout information of a spectacle frame to which the spectacle lens is fitted; an image processor that processes the original image data acquired by the original image data acquirer and generates image data representing an image viewed through a lens processed based on the frame data; a display that comprises a screen that visually simulates by displaying the image based on the image data generated by the image processor; a partial enlargement information acquirer that acquires partial enlargement information of a visual field, the partial enlargement information including a distance from a spectacle lens wearer to the screen of the display and a dimension of the screen, wherein a processing mode of the image processor includes: an entire display mode in which the visual field based on the shape data is entirely displayed on the screen of the display; and a partial display mode in which a part of the visual field determined by the distance from the spectacle wearer to the screen of the display and the dimension of the screen acquired by the partial enlargement information acquirer is displayed, the screen of the display is a flat display screen that satisfies the following relationship: tan(θ v/ 2)/tan(θ h/ 2)= Dv/Dh (1) L *tan(θ h/ 2)= K*Dh (2) where a horizontal dimension of the flat display screen is Dh, a vertical dimension of the flat display screen is Dv, a distance from the spectacle wearer to the flat display screen is L, a horizontal angle of the visual field corresponding to the image displayed on the flat display screen is θh, a vertical angle of the visual field corresponding to the image displayed on the flat display screen is θv and K is a constant that satisfies a relationship of 0.35≦K≦0.75.