US 12,265,282 B2
Method to establish the size of the different areas of a progressive lens
Santiago Soler Monente, Madrid (ES); Pau Artús Colomer, Barcelona (ES); Glòria Casanellas Peñalver, Barcelona (ES); Rocío B. Rodríguez Domínguez, Barcelona (ES); and Javier Vegas Caballero, Barcelona (ES)
Assigned to HORIZONS OPTICAL, S.L.U., Barcelona (ES)
Filed by HORIZONS OPTICAL, S.L.U., Barcelona (ES)
Filed on Apr. 6, 2022, as Appl. No. 17/714,394.
Claims priority of application No. 21382289 (EP), filed on Apr. 6, 2021.
Prior Publication US 2022/0326543 A1, Oct. 13, 2022
Int. Cl. G02C 7/02 (2006.01); A61B 3/113 (2006.01); G02C 7/06 (2006.01)
CPC G02C 7/027 (2013.01) [A61B 3/113 (2013.01); G02C 7/066 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method to establish the size of the zones of the near AC, far AL and intermediate AI vision of a progressive lens, wherein the method comprises the following steps:
a. generating a gaze map through the use of virtual reality in a near plane and a distant plane;
b. calculating a maximum horizontal amplitude of each map in degrees, ΔaL, ΔaC;
c. calculating a maximum vertical amplitude of each map in degrees ΔbL, ΔbC;
d. determining the size of the far vision area AL in mm2 from an average of the maximum horizontal and vertical amplitude in the far plane (ΔabL) following a linear relationship whose result for ΔabL values between 10° and 80° is obtained according to the following relationship:
AL=i×ΔabL+j,
wherein I has values between 1.0 mm2/° and 1.4 mm2/° and j has values between 120 mm2 and 160 mm2;
wherein AL is the area in mm2 in the far zone where the astigmatism value is less than 0.50D and the mean power value is less than +0.25D of a target far power value; said area AL limiting, in its upper part, 8 mm above the position of the pupil, and, in its lower part, 4 mm below the position of the pupil;
e. determining the size of the near vision area (AC) in mm2 from the average of the maximum amplitude in horizontal and vertical in the near plane (ΔabC) following a linear relationship whose result for values of ΔabC between 10° and 80° is obtained according to the following relationship:
AC=k×ΔabC+l,
wherein k has values between 0.15 mm2/° and 0.25 mm2/° and wherein l has values between 20 mm2 and 30 mm2;
wherein AC is the area in mm2 in the near zone where the astigmatism value is less than 0.50D and the mean power value is greater than 85% of a target value of addition; said area AC limiting, at the bottom, 2 mm below the point known as the near reference point;
f. determining the size of the intermediate vision area AI in mm2 from the angle βPMLC formed by:
the points of maximum frequency of use in each of the far and near planes, PML and PMC, or, when there is more than one point with the same maximum frequency value per plane, a respective point having as horizontal coordinate the average of the horizontal coordinates of the maximum points found, and as vertical coordinate the average of the vertical coordinates of the maximum points found,
with respect to the origin of coordinates following a linear relation whose result for βPMLC values between 0° and 18° is obtained according to the following relationship:
AI=m×βPMLC+n
wherein m has values between 0.5 mm2/° and 1.5 mm2/° and n has values between 15 mm2 and 30 mm2;
wherein AI is the area in mm2 in the intermediate zone where the value of astigmatism is less than 0.50D, and the value of the mean power is greater than +0.25D of the far target power value and the average power value is less than 85% of the target value of the addition;
wherein said origin of coordinates is the origin (0,0,0) of a Cartesian coordinate system at the midpoint of a vector joining the user's pupils, wherein the xy plane is defined parallel to the ground and the z axis perpendicular to the ground; and
wherein steps b-f are performed by a processor.