GB905289A - Improvements in corneal contact lenses - Google Patents

Improvements in corneal contact lenses

Info

Publication number
GB905289A
GB905289A GB3143859A GB3143859A GB905289A GB 905289 A GB905289 A GB 905289A GB 3143859 A GB3143859 A GB 3143859A GB 3143859 A GB3143859 A GB 3143859A GB 905289 A GB905289 A GB 905289A
Authority
GB
United Kingdom
Prior art keywords
lens
zone
radii
cornea
zones
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
GB3143859A
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.)
Plastic Contact Lens Co
Original Assignee
Plastic Contact Lens Co
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 Plastic Contact Lens Co filed Critical Plastic Contact Lens Co
Publication of GB905289A publication Critical patent/GB905289A/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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/048—Means for stabilising the orientation of lenses in the eye
    • 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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/043—Translating type
    • 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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/044—Annular configuration, e.g. pupil tuned
    • 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
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/045—Sectorial configuration

Abstract

905,289. Polyfocal contact lenses. PLASTIC CONTACT LENS CO. Sept. 15, 1959 [Oct. 6, 1958], No. 31438/59. Class 97 (1). A poly-focal or mono-focal contact lens is adapted to adhere to the cornea by the lacrimal layer's capillary attraction and has means to prevent it from rotating on the cornea. An example of a bifocal lens is shown in Fig. 2, in which the radii of curvature of zone 30 are chosen for distant vision and those of zone 32 for near vision. The posterior radii of the zone may be equal in order to prevent the lens from rotating either its centre of gravity is arranged to be below its axis or its posterior surface is made toric to correspond with the shape of the eye. The centre of gravity may be lowered by (1) making the lower zone thicker than the upper zone, for example, by making zone surfaces eccentric, (2) by inserting in the lower zone a heavier piece of glass or plastic, in which case the change of power may be due to the different refractive indices of the zones and not to their different radii, or (3) by replacing the circular outlined lens by one having the outline shown in Fig. 8. One way of forming the lens (see Fig. 12) is to mould a large lens 56, the radii of which correspond with those required for one of the zones and then cut or mould a section 132 of this lens to the curvature required for the other zone. Several lens L<SP>4</SP> may then be cut from this large lens. Specification 882,907 is referred to.
GB3143859A 1958-10-06 1959-09-15 Improvements in corneal contact lenses Expired GB905289A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US76555358A 1958-10-06 1958-10-06

Publications (1)

Publication Number Publication Date
GB905289A true GB905289A (en) 1962-09-05

Family

ID=25073856

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3143859A Expired GB905289A (en) 1958-10-06 1959-09-15 Improvements in corneal contact lenses

Country Status (3)

Country Link
DE (1) DE1136846B (en)
FR (1) FR1236413A (en)
GB (1) GB905289A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597055A (en) * 1969-01-28 1971-08-03 Charles W Neefe Monocentric bifocal contact lens
JPS49102750U (en) * 1972-12-25 1974-09-04
WO2003069393A1 (en) * 2002-02-14 2003-08-21 Novartis Ag Contact lenses with off-center sphere surface

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1199019B (en) * 1959-06-24 1965-08-19 Raymonde Jeanne Augustine Koch Bifocal corneal cup
US3431327A (en) * 1964-08-31 1969-03-04 George F Tsuetaki Method of making a bifocal contact lens with an embedded metal weight
US3684357A (en) * 1970-01-19 1972-08-15 George F Tsuetaki Fused bifocal contact lens unit
US4981342A (en) * 1987-09-24 1991-01-01 Allergan Inc. Multifocal birefringent lens system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1206929A (en) * 1958-03-03 1960-02-12 Bifocal contact lens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597055A (en) * 1969-01-28 1971-08-03 Charles W Neefe Monocentric bifocal contact lens
JPS49102750U (en) * 1972-12-25 1974-09-04
WO2003069393A1 (en) * 2002-02-14 2003-08-21 Novartis Ag Contact lenses with off-center sphere surface
US6883915B2 (en) 2002-02-14 2005-04-26 Novartis Ag Contact lenses with off-center sphere surface

Also Published As

Publication number Publication date
FR1236413A (en) 1960-07-15
DE1136846B (en) 1962-09-20

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