Eyeglass lens
Provided is an eyeglass lens including: a first region formed such that light transmitted therethrough is focused at a predetermined position in an eye; and a plurality of second regions formed such that light transmitted therethrough is focused at a position defocused from the predetermined position, wherein the plurality of second regions have negative spherical aberration.
1 . An eyeglass lens comprising: a first region formed such that light transmitted therethrough is focused at a predetermined position in an eye; and a plurality of second regions formed such that light transmitted therethrough is focused at a position defocused from the predetermined position,
wherein the plurality of second regions have negative spherical aberration such that light perceived in peripheral vision is recognized as pseudo-focusing at a position other than the predetermined position, and
wherein the pseudo-focusing is caused by overlap between light fluxes of the plurality of second regions.
2 . The eyeglass lens according to claim 1 , wherein the plurality of second regions are provided with spherical aberration such that an evaluation value using a Gabor function for the transmitted light in the peripheral vision has a maximum value at a position other than the predetermined position.
3 . The eyeglass lens according to claim 2 , wherein the plurality of second regions are provided with spherical aberration such that an evaluation value using a Gabor function for the transmitted light in the peripheral vision has a largest value at a position other than the predetermined position.
4 . The eyeglass lens according to claim 3 , wherein the plurality of second regions have the negative spherical aberration, and thus a ray that passes through an outermost portion of each second region and a ray transmitted through a point located inward of the outermost portion by 10% of the radius of the second region intersect each other at a position between the predetermined position and the position defocused from the predetermined position.
5 . The eyeglass lens according to claim 4 , wherein the plurality of second regions are formed such that each second region is in a shape of an aspherical face whose curvature decreases in accordance with an increase in a distance from a center of the second region.
6 . The eyeglass lens according to claim 5 , wherein a size and an arrangement interval of the plurality of second regions are set such that at least three of the plurality of second regions are arranged within a pupil diameter range through which the transmitted light passes and such that a figure formed by connecting reference points of the respective three second regions is an acute-angle triangle.
7 . The eyeglass lens according to claim 6 , wherein the plurality of second regions are hexagonally arranged.
8 . The eyeglass lens according to claim 7 ,
wherein the plurality of second regions have a multilayer structure,
an innermost layer in the multilayer structure is a layer that functions to impart a defocus power, and
an outer layer thereof is a layer that functions to impart negative spherical aberration.
9 . The eyeglass lens according to claim 1 , wherein the plurality of second regions are provided with spherical aberration such that an evaluation value using a Gabor function for the transmitted light in the peripheral vision has a largest value at a position other than the predetermined position.
10 . The eyeglass lens according to claim 1 , wherein the plurality of second regions have the negative spherical aberration, and thus a ray that passes through an outermost portion of each second region and a ray transmitted through a point located inward of the outermost portion by 10% of the radius of the second region intersect each other at a position between the predetermined position and the position defocused from the predetermined position.
11 . The eyeglass lens according to claim 1 , wherein the plurality of second regions are formed such that each second region is in a shape of an aspherical face whose curvature decreases in accordance with an increase in a distance from a center of the second region.
12 . The eyeglass lens according to claim 1 , wherein a size and an arrangement interval of the plurality of second regions are set such that at least three of the plurality of second regions are arranged within a pupil diameter range through which the transmitted light passes and such that a figure formed by connecting reference points of the respective three second regions is an acute-angle triangle.
13 . The eyeglass lens according to claim 1 , wherein the plurality of second regions are hexagonally arranged.
14 . The eyeglass lens according to claim 1 ,
wherein the plurality of second regions have a multilayer structure,
an innermost layer in the multilayer structure is a layer that functions to impart a defocus power, and
an outer layer thereof is a layer that functions to impart negative spherical aberration.