Abstract: A method for designing an eyeglass lens includes an eyeball model construction step of determining a value of a parameter of each of a plurality of optical elements, and constructing an eyeball model, an aberration acquisition step of making a light ray incident at a predetermined angle with respect to a visual axis of the eyeball model to obtain an off-axis aberration in a paracentral portion and a peripheral portion of a retina of the eyeball model by an optical simulation, an aspherical coefficient value calculation step of disposing an eyeglass lens on a front side of the eyeball model and performing the optical simulation to obtain an aspherical coefficient value acting in a direction of reducing the off-axis aberration, and an aspherical shape determination step of determining an aspherical shape of the eyeglass lens based on the aspherical coefficient value.

Abstract: The display system includes a first storage unit storing standardized data composed chromaticity values and luminance values. An information acquirer acquires luminance values and chromaticity values of a visual target and luminance and chromaticity values of a background thereof. A standardization unit standardizes the chromaticity values and the luminance values of the visual target and the background based on these chromaticity values and the luminance values of the visual target and the background thereof and the standardized data stored in the first storage unit. A visual target contrast calculator calculates a contrast of a visual target to a background by measuring a distance in a color space between the visual target and the background each defined by the standardized luminance and chromaticity values. A second storage unit stores an expression defining a relation between the contrast thereof to the background and a size of the visual target.

Abstract: The display system includes a first storage unit storing standardized data composed chromaticity values and luminance values. An information acquirer acquires luminance values and chromaticity values of a visual target and luminance and chromaticity values of a background thereof. A standardization unit standardizes the chromaticity values and the luminance values of the visual target and the background based on these chromaticity values and the luminance values of the visual target and the background thereof and the standardized data stored in the first storage unit. A visual target contrast calculator calculates a contrast of a visual target to a background by measuring a distance in a color space between the visual target and the background each defined by the standardized luminance and chromaticity values. A second storage unit stores an expression defining a relation between the contrast thereof to the background and a size of the visual target.