US 12,140,821 B2
Progressive addition lens and design method therefor
Hiroshi Asami, Tokyo (JP); Yasunori Izawa, Tokyo (JP); and Tadashi Kaga, Tokyo (JP)
Assigned to HOYA LENS THAILAND LTD., Pathumthani (TH)
Appl. No. 17/280,997
Filed by HOYA LENS THAILAND LTD., Pathumthani (TH)
PCT Filed Sep. 27, 2019, PCT No. PCT/JP2019/038390
§ 371(c)(1), (2) Date Mar. 29, 2021,
PCT Pub. No. WO2020/067522, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-185993 (JP), filed on Sep. 28, 2018; application No. 2018-186038 (JP), filed on Sep. 28, 2018; application No. 2019-048645 (JP), filed on Mar. 15, 2019; application No. 2019-048646 (JP), filed on Mar. 15, 2019; application No. 2019-048647 (JP), filed on Mar. 15, 2019; and application No. 2019-093366 (JP), filed on May 17, 2019.
Prior Publication US 2021/0356765 A1, Nov. 18, 2021
Int. Cl. G02C 7/06 (2006.01); G02C 7/02 (2006.01)
CPC G02C 7/063 (2013.01) [G02C 7/024 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A progressive addition lens, comprising:
a near portion for viewing a near distance;
a distance portion for viewing a distance farther than the near distance; and
an intermediate portion provided between the near portion and the distance portion and having a progressive refraction function,
wherein a transmission astigmatism having an absolute value exceeding zero and 0.25 D or less is added to the near portion and the intermediate portion,
and
in the near portion and intermediate portion to which the transmission astigmatism is added, the progressive addition lens further includes a portion in which an amount of horizontal refractive power is greater than an amount of vertical refractive power after subtracting the refractive power for astigmatism correction.