GB905289A - Improvements in corneal contact lenses - Google Patents
Improvements in corneal contact lensesInfo
- 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
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
Landscapes
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
- Prostheses (AREA)
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.
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)
| 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)
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1206929A (en) * | 1958-03-03 | 1960-02-12 | Bifocal contact lens |
-
1959
- 1959-07-30 DE DE1959P0023281 patent/DE1136846B/en active Pending
- 1959-09-15 GB GB3143859A patent/GB905289A/en not_active Expired
- 1959-09-23 FR FR805829A patent/FR1236413A/en not_active Expired
Cited By (4)
| 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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