Low-convergence negative power spectacles
A convergence-reducing lens, wherein a central normal of the convergence-reducing lens defines a z-axis, and a center of the convergence-reducing lens defines a tangential, centered x-y plane, together defining a coordinate system, the convergence-reducing lens comprising a distance-vision region, having a negative distance-vision optical power, to refract a light ray, directed parallel to the z-axis at a distance-vision region point at an x-distance from a y-z plane of the coordinate system, so that its extension intersects the y-z plane at a distance-vision intersection z-distance; and a near-vision region, having a near-vision optical power that matches the distance-vision optical power within 0.5D, to refract a light ray, directed parallel to the z-axis at a near-vision region point at the x-distance of the distance-vision region point, at a corresponding y height, so that its extension intersects the y-z plane at a near-vision intersection z-distance that is smaller than the distance-vision intersection z-distance.
1. A convergence-reducing lens of a low-convergence spectacle, wherein:
a central normal of the convergence-reducing lens defines a z-axis, and a center of the convergence-reducing lens defines a tangential, centered x-y plane, together defining an x-y-z coordinate system of the convergence-reducing lens, the convergence-reducing lens comprising
a distance-vision region, having a negative distance-vision optical power, configured to refract a light ray, directed parallel to the z-axis at a distance-vision region point at an x-distance from a y-z plane of the coordinate system, so that an extension of the refracted light ray intersects the y-z plane at a distance-vision intersection z-distance; and
a near-vision region, having a near-vision optical power that matches the distance-vision optical power within 0.5 D, configured to refract a light ray, directed parallel to the z-axis at a near-vision region point at the x-distance of the distance-vision region point, at a corresponding y height, so that an extension of the refracted light ray intersects the y-z plane at a near-vision intersection z-distance that is smaller than the distance-vision intersection z-distance.
2. The convergence-reducing lens of claim 1 , wherein:
the distance-vision region is configured to refract the light ray, directed parallel to the z-axis at the distance-vision region point at the x-distance, by a distance-vision refraction angle;
the near-vision region is configured to refract the light ray, directed parallel to the z-axis at the near-vision region point at the x-distance, at the corresponding y height, by a near-vision refraction angle; and
an x-component of the near-vision refraction angle is greater than an x-component of the distance-vision refraction angle.
3. The convergence-reducing lens of claim 1 , wherein:
the distance-vision region is configured to refract the light ray, directed parallel to the z-axis at the distance-vision region point at the x-distance so that its extension intersects the y-z plane with a distance-vision gaze-convergence angle;
the near-vision region is configured to refract the light ray directed parallel to the z-axis at the near-vision region point at the x-distance, at the corresponding y height, so that its extension intersects the y-z plane with a near-vision gaze-convergence angle; and
the near-vision gaze-convergence angle is greater than the distance-vision gaze-convergence angle.
4. The convergence-reducing lens of claim 1 , comprising:
a progression region, at least partially between the distance-vision region and the near-vision region, configured to refract a light ray, directed parallel to the z-axis at a progression region point at the x-distance of the distance-vision region point, to intersect the y-z plane at a progression intersection z-distance that is between the near-vision intersection z-distance and the distance-vision intersection z-distance.
5. The convergence-reducing lens of claim 1 , wherein:
the near-vision region has an area larger than 5 mm 2 .
6. The convergence-reducing lens of claim 1 , wherein:
the near-vision region has an area larger than 10 mm 2 .
7. The convergence-reducing lens of claim 1 , wherein:
the near-vision optical power matches the distance-vision optical power within 0.25 D.
8. The convergence-reducing lens of claim 1 , wherein:
the near-vision region is one of an oval, a quadrant, a triangle, a rectangle, an elongated region, a diagonal region, a channel, a corridor, a circle, and a D-shape.
9. The convergence-reducing lens of claim 1 , wherein:
a majority of the near-vision region is located in a lower-inferior nasal quadrant of the convergence-reducing lens.
10. The convergence-reducing lens of claim 1 , wherein:
the near-vision intersection z-distance is smaller than the distance-vision intersection z-distance as determined by at least one of an image-adjusting protocol, a lens-adjusting protocol, and a source-adjusting protocol.
11. The convergence-reducing lens of claim 1 , comprising:
a front surface, having
a distance-vision front-tangential, touching the front surface in the distance-vision region at a nasal x-distance from the center of the coordinate system, and
a near-vision front-tangential, touching the front surface in the near-vision region at the nasal x-distance and at a corresponding y height; and
a rear surface, having
a distance-vision rear-tangential, touching the rear surface in the distance-vision region at the nasal x-distance, and
a near-vision rear-tangential, touching the rear surface in the near-vision region at the nasal x-distance and at the corresponding y height; wherein
the distance-vision front-tangential and the distance-vision rear-tangential form a distance-vision surface convergence angle, and
the near-vision front-tangential and the near-vision rear-tangential form a near-vision surface convergence angle, wherein
the near-vision surface convergence angle is greater than the distance-vision surface convergence angle.
12. The convergence-reducing lens of claim 1 , wherein:
the distance-vision region has a distance-vision z-axis;
the near-vision region has a near-vision z-axis, wherein
the near-vision z-axis is rotated in a nasal direction relative to the distance-vision z-axis.
13. The convergence-reducing lens of claim 1 , wherein:
at least one of the distance-vision region and the near-vision region has at least one of an aspheric component, a power-neutral component, a cylinder, a coma, and an astigmatic component.
14. A convergence-reducing lens, wherein:
a central normal of the convergence-reducing lens defines a z-axis, and a center of the convergence-reducing lens defines a tangential, centered x-y plane, together defining an x-y-z coordinate system of the convergence-reducing lens, the convergence-reducing lens comprising
a distance-vision region, having a negative distance-vision optical power, configured to refract a light ray, directed by a source at a distance-vision region point at an x-distance from a y-z plane of the coordinate system, to form a distance-vision light-convergence angle with the y-z plane, wherein the source is located on the z-axis at an intersection z-distance from a center of the coordinate system; and
a near-vision region, having a near-vision optical power that matches the distance-vision optical power within 0.5 D, configured to refract a light ray, directed by the source at a near-vision region point at the x-distance from the y-z plane of the coordinate system, at a corresponding y height, to form a near-vision light-convergence angle with the y-z plane, wherein
the source is located on the z-axis at the intersection z-distance from the center of the coordinate system; and
an x-component of the near-vision light-convergence angle is greater than an x-component of the distance-vision light-convergence angle.
15. A convergence-reducing lens of claim 14 , wherein:
the distance-vision region is configured to refract a light ray, directed by the source at the distance-vision region point at the x-distance from the y-z plane of the coordinate system, by a distance-vision refraction angle;
the near-vision region is configured to refract a light ray, directed by the source at the near-vision region point at the x-distance from the y-z plane of the coordinate system, by a near-vision refraction angle; and
an x-component of the near-vision refraction angle is greater than an x-component of the distance-vision refraction angle.
16. The convergence-reducing lens of claim 14 , comprising:
a front surface, having
a distance-vision front-tangential at a nasal x-distance from the center of the coordinate system, and
a near-vision front-tangential at the nasal x-distance; and
a rear surface, having
a distance-vision rear-tangential at the nasal x-distance, and
a near-vision rear-tangential at the nasal x-distance; wherein
the distance-vision front-tangential and the distance-vision rear-tangential form a distance-vision surface convergence angle, and
the near-vision front-tangential and the near-vision rear-tangential form a near-vision surface convergence angle, wherein
the near-vision surface convergence angle is greater than the distance-vision surface convergence angle.
17. The convergence-reducing lens of claim 14 , wherein:
the distance-vision region has a distance-vision z-axis;
the near-vision region has a near-vision z-axis, wherein
the near-vision z-axis is rotated in a nasal direction relative to the distance-vision z-axis.
18. The convergence-reducing lens of claim 14 , wherein:
the x-component of the near-vision light-convergence angle is greater than the x-component of the distance-vision light-convergence angle as determined by at least one of an image-adjusting protocol, a lens-adjusting protocol, and a source-adjusting protocol.
19. A convergence-reducing lens of a low-convergence spectacle, wherein:
a central normal of the convergence-reducing lens defines a z-axis, and a center of the convergence-reducing lens defines a tangential, centered x-y plane, together defining an x-y-z coordinate system of the convergence-reducing lens, the convergence-reducing lens comprising
a distance-vision region, having a negative distance-vision optical power, and a near-vision region, having a near-vision optical power that matches the distance-vision optical power within 0.5 D;
a front surface, having
a distance-vision front-tangential, touching the front surface in the distance-vision region at a nasal x-distance from the center of the coordinate system, and
a near-vision front-tangential, touching the front surface in the near-vision region at the nasal x-distance and at a corresponding y height; and
a rear surface, having
a distance-vision rear-tangential, touching the rear surface in the distance-vision region at the nasal x-distance, and
a near-vision rear-tangential, touching the rear surface in the near-vision region at the nasal x-distance and at the corresponding y height; wherein
the distance-vision front-tangential and the distance-vision rear-tangential form a distance-vision surface convergence angle, and
the near-vision front-tangential and the near-vision rear-tangential form a near-vision surface convergence angle, wherein
the near-vision surface convergence angle is greater than the distance-vision surface convergence angle.