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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7740354 | Multi-layered gradient index progressive lens The present invention relates to a gradient index progressive addition spectacle lens that provides improved optical performance and a wide visual field. The lens comprises a plurality of axially layered and bonded lens sections of continuous curvature at least one ... | 06/22/2010 |
| 7735998 | Multi-layered multifocal lens with blended refractive index The lens of the present invention relates to multifocal spectacle lenses, including bifocal and trifocal lenses, with improved cosmetic appearance, optical performance and wide visual field. The lens comprises a plurality of axially layered and bonded lens sections ... | 06/15/2010 |
| 7717558 | Pseudo-accommodative IOL having diffractive zones with varying areas In one aspect of the invention, a multifocal ophthalmic lens includes an optic and a plurality of diffractive zones disposes about an optical axis of the optic. At least two of the diffractive zones have different areas so as to cause broadening of optical energy pr... | 05/18/2010 |
| 7481532 | Pseudo-accommodative IOL having multiple diffractive patterns In one aspect, a trifocal ophthalmic lens is disclosed that includes an optic having a surface that comprises at least one trifocal diffractive pattern and at least one bifocal diffractive pattern such that the bifocal pattern provides near and far vision and the tr... | 01/27/2009 |
| 7253948 | Optical magnification device for distance variation An optical magnification device for varying the distance between an observer's eye (1) and an object (7), e.g., for a binocular magnifier or a microscope, in which focusing onto the object (7) is accomplished by means of progressive lenses (3) d... | 08/07/2007 |
| 7044597 | Multifocal contact lens and method of manufacture thereof An optical zone for a lens has a center optical axis. A first region of the optical zone includes a first optical curve having a first optical axis that is collinear with the center optical axis. A plurality of secondary regions is formed within the first region. Ea... | 05/16/2006 |
| 7021762 | Multifocal spectacle lens There is provided a multifocal spectacle lens having a front surface and a back surface each of the front surface and the back surface is formed as a multifocal surface or a progressive-power surface, distributions of surface power of the front surface and the back ... | 04/04/2006 |
| 6860599 | Multiple bifocal or trifocal lens The present invention allows the user to have custom-made lenses where the far-distance corrective segment is always located in the central region of the lens and allowing the user full range of left to right eye movement to view far-distanced objects at eye level. ... | 03/01/2005 |
| 6361165 | Flyglasses Flyglasses having two lenses, at least one of which is faceted and both of which are held in a mount that is preferably flat. The mount can be in the form of a so-called lorgnette having a handle made in the form of a small board which is especially suite... | 03/26/2002 |
| 6322215 | Non-progressive trifocal ophthalmic lens This invention relates to a novel, non-progressive trifocal ophthalmic lens comprising distance-vision, near-vision and intermediate-vision optic fields. The non-progressive element of the trifocal lens is achieved by blending the transition zones between... | 11/27/2001 |
| 5953099 | Nonprogressive multi-focal ophthalmic lens A non-progressive multi-focal ophthalmic lens having a first arcuate area for distance viewing and a second arcuate segment, whereby the first area and second segment share a seamless transition corridor that does not obstruct or distort vision when shift... | 09/14/1999 |
| 5847803 | Optic incorporating a power gradient A progressive optic has an optical preform wherein the radius of curvature of the surface is altered by forming discrete spherical portions across the surface. A thin intermediate layer, having a different refractive index from the optical preform, is the... | 12/08/1998 |
| 5305028 | Multifocal lens provided with progressive focal segment A multifocal lens has a main lens with a far vision surface refracting power sphere (F) and a near vision sphere (N) and a progressive focal area (P) or an intermediate vision sphere (I), a progressive focal point (P) and a near vision sphere (N) on a seg... | 04/19/1994 |
| 5089024 | Multi-focal intraocular lens An intraocular lens, for use within the human eye, contains three concentric regions. An innermost region provides far-field vision. A middle region, surrounding the innermost region, provides near-field vision. An outermost region, surrounding the middle... | 02/18/1992 |
| 5073021 | Bifocal ophthalmic lens constructed from birefringent material A dual focal length ophthalmic lens is formed from a birefringent material with its fast and slow axes perpendicular to the user's visual axis. The dual focal property arises due to the differing indices of refraction of the birefringent material for ligh... | 12/17/1991 |
| 5017000 | Multifocals using phase shifting This invention relates to a multifocal optical lens configuration that relies on the phenomenon of simultaneous vision whereby the eye is presented with two clear images at once. In particular this invention allows a lens to be made with arbitrary relativ... | 05/21/1991 |
| 4952048 | Method of designing a non-progressive multifocal ophthalmic lens The present invention relates to a multifocal ophthalmic lens which comprises a first substantially spherical area for distance viewing, a second substantially spherical area for near viewing having a desired width and height and being surrounded on a plu... | 08/28/1990 |
| 4869588 | Non-progressive multifocal ophthamic lenses The present invention relates to a multifocal ophtalmic lens which comprises a first substantially spherical area for distance viewing, a second substantially spherical area for near viewing having a desired width and height and being surrounded on a plur... | 09/26/1989 |
| 4828558 | Laminate optic with interior Fresnel lens Composite lens, especially an intraocular lens for insertion through an incision into an eye and desirably containing haptics, comprising a flat, partially hollow laminate optic, formed by a pair of relatively thin, sheet-like elements having opposed inte... | 05/09/1989 |
| 4796988 | Progressive lens A progressive lens with a continuous surface comprises three substantially constant power areas. A first such area is mathced to far vision, a second to near vision and a third, between the first and second areas, to intermediate vision. Respective progre... | 01/10/1989 |
| 4690524 | Multifocal spectacle lens having a large near-vision part The invention is directed to a multifocal spectacle lens having an especially large near-vision part. A supplementary component is fused into a base dimensioned for the near-vision range. The supplementary part is for at least one distance-vision range. I... | 09/01/1987 |
| 4640587 | Method for manufacturing a spectacle lens for myopes There is described a method for manufacturing a spectacle lens for myopes the edge thickness of which may be considered as substantial, which comprises starting with a semi-machined product with a concave hollowing which extends to the edge or substantial... | 02/03/1987 |
| 4484804 | Multifocal ophthalmic lenses Multifocal ophthalmic lenses are disclosed such as a bifocal lens in which the convex front surface includes an upper part for distant vision having a first spherical surface and a lower part for reading having a second spherical surface, the radius of th... | 11/27/1984 |
| 4247179 | Multifocal spectacle lens A multifocal spectacle lens having a single base lens member and at least two additional parts adjacent to each other, attached to the base lens member by fusing or cementing. These additional parts are so shaped that imaginary tangential planes lying in ... | 01/27/1981 |
| 4055379 | Multifocal lens A multifocal ophthalmic lens is described on which one refractive surface is formed to provide a plurality of vertically juxtaposed viewing zones each of which has constant dioptric focal power. The constant dioptric focal power in the various zones incre... | 10/25/1977 |
| 3997249 | Ion exchangeable segment glass There is disclosed an ion exchange-strengthened ophthalmic segment glass suitable for the fabrication of fused bifocal and trifocal ophthalmic lenses. More particularly, there is disclosed a lanthanum-silicate based ophthalmic segment glass having indices... | 12/14/1976 |
