GB270906A - Improvements in and relating to ophthalmic lenses - Google Patents

Improvements in and relating to ophthalmic lenses

Info

Publication number
GB270906A
GB270906A GB1359626A GB1359626A GB270906A GB 270906 A GB270906 A GB 270906A GB 1359626 A GB1359626 A GB 1359626A GB 1359626 A GB1359626 A GB 1359626A GB 270906 A GB270906 A GB 270906A
Authority
GB
United Kingdom
Prior art keywords
lens
insert
refraction
compensate
curve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1359626A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Optical Corp
Original Assignee
American Optical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Optical Corp filed Critical American Optical Corp
Priority to GB1359626A priority Critical patent/GB270906A/en
Publication of GB270906A publication Critical patent/GB270906A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

270,906. Redfern, C. G., (American Optical Co.). May 28, 1926. Spectacle lenses.-A multifocal lens comprises a major lens 1 of one index of refraction and an insert 8 of another index of refraction, the power of which is modified to compensate for the resultant astigmatisms of both the insert 8 and the portion of the major lens 1. This may be done by (1) grinding the curve 7 of the insert 8 to a toric shape (2) by making the curve 7 of a portion of a sphere and after fusing in place to bend the whole lens to toric form or (3) in place of bending the lens in this manner mentioned to grind the surface 3 to a toric shape sufficient to compensate the astigmatism.
GB1359626A 1926-05-28 1926-05-28 Improvements in and relating to ophthalmic lenses Expired GB270906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1359626A GB270906A (en) 1926-05-28 1926-05-28 Improvements in and relating to ophthalmic lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1359626A GB270906A (en) 1926-05-28 1926-05-28 Improvements in and relating to ophthalmic lenses

Publications (1)

Publication Number Publication Date
GB270906A true GB270906A (en) 1927-05-19

Family

ID=10025858

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1359626A Expired GB270906A (en) 1926-05-28 1926-05-28 Improvements in and relating to ophthalmic lenses

Country Status (1)

Country Link
GB (1) GB270906A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1497658B1 (en) * 1966-09-29 1970-04-23 Zeiss Carl Fa Two-star magnifying glass

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1497658B1 (en) * 1966-09-29 1970-04-23 Zeiss Carl Fa Two-star magnifying glass

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