# US 8,382,282 B2 · Progressive reading and intermediate distance lens defined by employment of a zernike expansion > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,382,282 B2 - Document ID: US8382282B2 - Status: Granted - Kind: B2 - Application number: 12/740,172 - Filed: 2008-10-30 - Published: 2010-09-30 - Granted: 2013-02-26 - Earliest claimed: 2007-10-30 - Assignees: Visionware LLC - Applicants: John D. Lytle - Inventors: John D. Lytle - Web page: https://patentgrep.com/patent/US8382282B2 ## CPC - G02C 7/024: {Methods of designing ophthalmic lenses} - G02C 7/028: {Special mathematical design techniques} - G02C 7/061: {Spectacle lenses with progressively varying focal power} - G02C 7/063: {Shape of the progressive surface} - G02C 7/066: {Shape, location or size of the viewing zones} - G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00) ## Abstract There is provided a lens that includes a surface having a continuous monotonic change of power through (a) a first zone for reading at a distance of about 35 centimeters to about 45 centimeters from said lens through (b) a second zone for viewing at near and intermediate distances from about 45 centimeters to about four meters from said lens. The second zone includes a corridor having a length of greater than or equal to about 16 millimeters and a width of greater than or equal to about 6 millimeters along said length. The lens has surface astigmatism less than or equal to about 0.5 diopter within said corridor, and is a progressive addition lens. ## Claims ### Claim 1 A lens comprising: a surface having a continuous monotonic change of power through (a) a first zone for reading at a distance of about 35 centimeters to about 45 centimeters from said lens through (b) a second zone for viewing at near and intermediate distances from about 45 centimeters to about four meters from said lens, wherein said second zone includes a corridor having a length of greater than or equal to about 16 millimeters and a width of greater than or equal to about 6 millimeters along said length, wherein said lens has surface astigmatism less than or equal to about 0.5 diopter within said corridor, and wherein said lens is a progressive addition lens. ### Claim 2 (depends on 1) The lens of claim 1, wherein said corridor has a width greater than or equal to about 15 millimeters along said length, and wherein said lens exhibits astigmatism less than or equal to about 1.0 diopter within said corridor. ### Claim 3 (depends on 1) The lens of claim 1, wherein said lens has a refracted root-mean-square angular blur radius less than or equal to about 0.0005 radians in said corridor, and wherein said corridor has a width greater than or equal to about 10 millimeters along said length. ### Claim 4 (depends on 1) The lens of claim 1, wherein said continuous monotonic change of power between a top of said corridor and a bottom of said corridor progresses at an average rate of less than or equal to 0.078 diopter per millimeter. ### Claim 5 (depends on 1) The lens of claim 1, wherein said lens has incremental surface power that varies from a constant value by less than or equal to about 0.075 diopter in a horizontal direction across said corridor. ### Claim 6 (depends on 5) The lens of claim 5, wherein said incremental surface power extends in said horizontal direction beyond said corridor. ### Claim 7 (depends on 1) The lens of claim 1, wherein said lens has incremental surface power that varies from a constant value by less than or equal to about 0.075 diopter in a horizontal direction over a width greater than or equal to about 10 millimeters that includes said corridor. ### Claim 8 (depends on 1) The lens of claim 1, wherein said lens has refracted power that progresses linearly from a first refracted power at a first point in said corridor to a second refracted power at a second point in said corridor in a vertical direction from said first point. ### Claim 9 (depends on 8) The lens of claim 8, wherein said refracted power extends in a horizontal direction across and beyond said corridor. ### Claim 10 (depends on 1) The lens of claim 1, wherein said second zone includes a third zone having a vertical dimension greater than or equal to about 12 millimeters within which refracted power continuously and monotonically changes to permit viewing at distances in a range of about 50 centimeters to 135 centimeters from said lens. ### Claim 11 (depends on 10) The lens of claim 10, wherein within said third zone, said refracted power progresses linearly between a top of said third zone and a bottom of said third zone. ### Claim 12 (depends on 1) The lens of claim 1, wherein said lens is for a lens holder such that when a person is wearing said lens holder, said corridor is situated in front of a pupil of said person. ### Claim 13 (depends on 1) The lens of claim 1, wherein said lens is one of two such lenses that when situated in a lens holder satisfy a span of interpupillary distances of at least 6 millimeters. ### Claim 14 (depends on 1) The lens of claim 1, wherein said lens is molded to fit an opening in a lens holder. ### Claim 15 (depends on 1) The lens of claim 1, wherein said lens is designed and manufactured to a predetermined boundary shape and boundary size of a lens holder for ultimate use. ### Claim 16 (depends on 1) The lens of claim 1, wherein said lens is created by representing an aspheric contour using a Zernike polynomial expansion having variables expressed in terms of radial and azimuthal coordinates. ### Claim 17 (depends on 16) The lens of claim 16, wherein said Zernike polynomial expansion employs at least ten terms. ### Claim 18 (depends on 1) The lens of claim 1, wherein said lens is designed pursuant to a method that employs, as a design parameter, a pupil size of a user of said lens.