GB424321A - Multifocal ophthalmic lenses and method of making the same - Google Patents
Multifocal ophthalmic lenses and method of making the sameInfo
- Publication number
- GB424321A GB424321A GB17656/34A GB1765634A GB424321A GB 424321 A GB424321 A GB 424321A GB 17656/34 A GB17656/34 A GB 17656/34A GB 1765634 A GB1765634 A GB 1765634A GB 424321 A GB424321 A GB 424321A
- Authority
- GB
- United Kingdom
- Prior art keywords
- minor
- reading
- lenticular surface
- lens
- major
- 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
- G02C7/06—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)
- Eyeglasses (AREA)
Abstract
424,321. Spectacle lenses. HUBBELL, D. D., 82, North High Street, Columbus, Ohio, U.S.A. June 14, 1934, No. 17656. Convention date, June 14, 1933. [Class 97 (i)] A one-piece ophthalmic lens blank has on one side a major lenticular surface, e.g. a distance portion, and a minor non-circular lenticular surface, e.g. a reading portion, the minor lenticular surface projecting above the major lenticular surface and the axis of generation of one surface being inclined with respect to that of the other. A blank is first moulded to have two surfaces of different curvatures on one side, the minor surface being raised and having an external contour of more than a half circle and less than a full circle as shown at 1, Fig. 2. The blank is mounted on a turntable and a grinding tool applied to the surface 2, i.e. the distance vision portion of the lens, the tool being moved to grind the top edge of the minor portion 1 as the table rotates. A protective collar of glass or hard wax may be fitted snugly and cemented round the minor portion 1 and with the axis of generation tilted from its former position the reading segment is ground, the remaining parts of the collar being then removed. A shoulder shaped like a double wedge thickest at the centre and pointed at the ends is present at the flat top of the reading segment. The size of this shoulder is reduced by extending the reading segment 1 above the horizontal diameter line 3-3. Fig. 7 shows a finished lens in which the size of the shoulder 8 has been further reduced by submerging the lower part of the reading segment giving rise to small shoulders at 10, 11. The shoulders 8, 10, 11, may be chamfered. The upper edge of the reading portion may be a straight line or flat arc joined to the circular edge by small arcs. The optical centre of the reading segment may be arranged at or near the dividing line in order to minimize jumping of the image as the vision passes over the dividing line. Fig. 17 shows a lens in which the minor lenticular surface 29 constitutes the distance portion and the major lenticular surface 27 the reading portion.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US424321XA | 1933-06-14 | 1933-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB424321A true GB424321A (en) | 1935-02-19 |
Family
ID=21921908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17656/34A Expired GB424321A (en) | 1933-06-14 | 1934-06-14 | Multifocal ophthalmic lenses and method of making the same |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB424321A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013104887A2 (en) | 2012-01-11 | 2013-07-18 | Hesco Bastion Limited | Gabion deployment platform |
-
1934
- 1934-06-14 GB GB17656/34A patent/GB424321A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013104887A2 (en) | 2012-01-11 | 2013-07-18 | Hesco Bastion Limited | Gabion deployment platform |
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