CA1167672A - Eyeglass lens for correction of nearsightedness - Google Patents
Eyeglass lens for correction of nearsightednessInfo
- Publication number
- CA1167672A CA1167672A CA000393266A CA393266A CA1167672A CA 1167672 A CA1167672 A CA 1167672A CA 000393266 A CA000393266 A CA 000393266A CA 393266 A CA393266 A CA 393266A CA 1167672 A CA1167672 A CA 1167672A
- Authority
- CA
- Canada
- Prior art keywords
- lens
- base lens
- lenticular
- negative
- ground
- 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
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)
- Glass Compositions (AREA)
Abstract
ABSTRACT
The eyeglass lenses consisting of a highly refrac-tive glass have a circular or oval lenticular ground-out portion. The lenticular ground-out portion is ground into a negative base lens. The diameter of the lenticular ground-out portion measures 20 to 30 mm. The transition of the lenticular ground-out portion into the negative base lens is continuous and in an aspheric form. The eyeglass lenses are substantially thinner and therefore lighter than the eyeglass lenses of the customary type and cause no "bull's eye" effect.
The eyeglass lenses consisting of a highly refrac-tive glass have a circular or oval lenticular ground-out portion. The lenticular ground-out portion is ground into a negative base lens. The diameter of the lenticular ground-out portion measures 20 to 30 mm. The transition of the lenticular ground-out portion into the negative base lens is continuous and in an aspheric form. The eyeglass lenses are substantially thinner and therefore lighter than the eyeglass lenses of the customary type and cause no "bull's eye" effect.
Description
1 16767~
Eyeglass lens for the correction of nearsightedness The present invention relates to an eyeglass lens for the correction of nearsightedness, comprising a base lens of a highly refractive glass or other materials in which a circular or oval lenticular portion is ground out.
It is difficult to provide myopes with suitable eye-glass lenses because of the thickness of the periphery of the lenses to be worn; this brings along enormous weight problems and limits the choice of the eyeglass-frames.
Also the so-called "bull's eye" effect is disadvantageous with these lenses. The weight problems and the esthetic short-comings are not removed even with the presently available eyeglass lenses having lenticular ground-out portions. The lenses of the customary type are represented in fig. 1 and 2. The embodiment according to fig. 1 consists of a positive base lens having a circular lenticular ground -out portion. The embodiment according to fig. 2 consists of a planar base lens having equally a circular lenticular ground-out portion.
The British patent 2 034 498 A describes ophthalmic lenses for myopes the negative base lens of which has been ground both on the front and the back faces thereof.
~ 167672
Eyeglass lens for the correction of nearsightedness The present invention relates to an eyeglass lens for the correction of nearsightedness, comprising a base lens of a highly refractive glass or other materials in which a circular or oval lenticular portion is ground out.
It is difficult to provide myopes with suitable eye-glass lenses because of the thickness of the periphery of the lenses to be worn; this brings along enormous weight problems and limits the choice of the eyeglass-frames.
Also the so-called "bull's eye" effect is disadvantageous with these lenses. The weight problems and the esthetic short-comings are not removed even with the presently available eyeglass lenses having lenticular ground-out portions. The lenses of the customary type are represented in fig. 1 and 2. The embodiment according to fig. 1 consists of a positive base lens having a circular lenticular ground -out portion. The embodiment according to fig. 2 consists of a planar base lens having equally a circular lenticular ground-out portion.
The British patent 2 034 498 A describes ophthalmic lenses for myopes the negative base lens of which has been ground both on the front and the back faces thereof.
~ 167672
- 2 ~
Such eyeglass lenses have bad optical properties and on the top of it an unesthetic aspect. Because of 1:he fact that the front face of the negative base lens is not shaped spherically (cylindrically), but has a posi-1:ive to negative ground-out portion causing an enormous reflexion, the optical image formation is deteriorated, as is the case e.g. with the bi-convex eyeglass lenses represented in Fig. 6 of this patent. The thickness of the periphery of the eyeglass lenses produced in this way is comparatively only insignificantly reduced so that the undesired "bull's eye" effect is not completely removed.
It is an object of the present invention to provide an eyeglass lens for the correction of nearsight-edness by which the above mentioned shortcomings of the eyeglass lenses of the customary type are eliminated.
Besides, the transition of the lenticular ground-out portion into the base lens should be largely camouflaged and made practically invi~ible. According to the present invention there is provided an eyeglass lens in which the base lens is a negative lens and the correction of the lenticular portion is ground into and continuous with the negative base lens on the back face thereof.
It is advantageous when the back face of the negative base lens has a planar to positive shape in the area thereof extending from said lenticular portion toward the peripheral rim of said base lens.
In one aspect of the present invention there is provided an eyeglass lens for the correction of nearsight-edness, comprising a base lens of highly refractive glass or other materials in which a circular or oval lenticular portion is ground out, characterized in that the base lens is a negative lens having a back face and the correction of the lenticular portion is ground into and continuous with the negative base lens on the back face.
~ 1~7672 - 2a -In a furth~r aspect of the present invention there is provided an eyeglass lens for the correction of nearsightedness, comprising a base lens of highly refractive glass in which a circular or oval lenticular portion is ground out, wherein the base lens is negative lens having back and front faces and the correction of the lenticular portion is progressively ground into (and continuous with) the negative base lens on the back face thereof and asperically shaped to be continuous with the base lens thereby providing a substantially imperceptible transition between the base lens and the lenticular portion.
In a further aspect of the present invention there is provided an eyeglass lens comprising a negative base lens having front and back faces and a lenticular portion formed in only a selected area of the back face of the base lens to provide an optical correction, the lenticular portion being shaped aspherically by meeting the remaining portion of the negative base lens along a continuous flattened curve thereby providing a substantially imperceptible transition between the base lens and the lenticular portion.
The invention is illustrated by way of example in the accompanying drawings wherein:
Fig. 1 shows a section of an eyeglass lens of the customary type consisting of a positive base lens having a circular lenticular ground-out portion, Fig. 2 shows a section of an eyeglass lens of the customary type consisting of a planar base lens having a ,, ~ ~67672 circular lenticular ground-out portion, Fig. 3 shows a section of the inventive eyeglass lens consisting of a negative base lens having a cir-cular or oval lenticular ground-out portion, Fig. 4 shows a section of the inventive eyeglass lens having a continuous transition of the lenticular ground-out portion into the negative base lens in asphe-rical form, and Fig. 5 shows a section of the inventive eyeglass lens consisting of a base lens which is planar to positive in the area extending toward the peripherical rim of the base lens.
Principally, the eyeglass lenses 1 according to fig.
Such eyeglass lenses have bad optical properties and on the top of it an unesthetic aspect. Because of 1:he fact that the front face of the negative base lens is not shaped spherically (cylindrically), but has a posi-1:ive to negative ground-out portion causing an enormous reflexion, the optical image formation is deteriorated, as is the case e.g. with the bi-convex eyeglass lenses represented in Fig. 6 of this patent. The thickness of the periphery of the eyeglass lenses produced in this way is comparatively only insignificantly reduced so that the undesired "bull's eye" effect is not completely removed.
It is an object of the present invention to provide an eyeglass lens for the correction of nearsight-edness by which the above mentioned shortcomings of the eyeglass lenses of the customary type are eliminated.
Besides, the transition of the lenticular ground-out portion into the base lens should be largely camouflaged and made practically invi~ible. According to the present invention there is provided an eyeglass lens in which the base lens is a negative lens and the correction of the lenticular portion is ground into and continuous with the negative base lens on the back face thereof.
It is advantageous when the back face of the negative base lens has a planar to positive shape in the area thereof extending from said lenticular portion toward the peripheral rim of said base lens.
In one aspect of the present invention there is provided an eyeglass lens for the correction of nearsight-edness, comprising a base lens of highly refractive glass or other materials in which a circular or oval lenticular portion is ground out, characterized in that the base lens is a negative lens having a back face and the correction of the lenticular portion is ground into and continuous with the negative base lens on the back face.
~ 1~7672 - 2a -In a furth~r aspect of the present invention there is provided an eyeglass lens for the correction of nearsightedness, comprising a base lens of highly refractive glass in which a circular or oval lenticular portion is ground out, wherein the base lens is negative lens having back and front faces and the correction of the lenticular portion is progressively ground into (and continuous with) the negative base lens on the back face thereof and asperically shaped to be continuous with the base lens thereby providing a substantially imperceptible transition between the base lens and the lenticular portion.
In a further aspect of the present invention there is provided an eyeglass lens comprising a negative base lens having front and back faces and a lenticular portion formed in only a selected area of the back face of the base lens to provide an optical correction, the lenticular portion being shaped aspherically by meeting the remaining portion of the negative base lens along a continuous flattened curve thereby providing a substantially imperceptible transition between the base lens and the lenticular portion.
The invention is illustrated by way of example in the accompanying drawings wherein:
Fig. 1 shows a section of an eyeglass lens of the customary type consisting of a positive base lens having a circular lenticular ground-out portion, Fig. 2 shows a section of an eyeglass lens of the customary type consisting of a planar base lens having a ,, ~ ~67672 circular lenticular ground-out portion, Fig. 3 shows a section of the inventive eyeglass lens consisting of a negative base lens having a cir-cular or oval lenticular ground-out portion, Fig. 4 shows a section of the inventive eyeglass lens having a continuous transition of the lenticular ground-out portion into the negative base lens in asphe-rical form, and Fig. 5 shows a section of the inventive eyeglass lens consisting of a base lens which is planar to positive in the area extending toward the peripherical rim of the base lens.
Principally, the eyeglass lenses 1 according to fig.
3 to 5 are made of highly refractive glass (e.g. highlite flint, index of refraction 1,7). A lenticular ground-out portion 2 having a variable dimension is ground into a nega-tive base lens 1 according to the required definite correc-tio~. The correction of the lenticular is ground into the negative base lens 1 in a circular or oval form whereby the dimensions of such a lenticular ground-out portion are usually smaller than those of the lenticular ground-out portions of the customary art. The transition edge 2a of the lenticular ground-out portion 2 into the base lens 1 is continuous and in aspherical form (see fig. 4 and 5).
The diameter of a circular lenticular ground-out portion as well as the thickness of the base lens are in accordance with the necessary correction to be carried out with the client and have therefore to be individually determined. Accordingly, at a defficiency of sight of e.g.
-14 dptr. a base lens of - 3,0 dptr. having a sufficient central thickness is ground, which lens allows a lenticular ground-out portion of - 14,0 dptr. with a diameter of approx. 22 to 25 mm and a subsequent central thickness of approx. 0,7 mm (see fig. 3). Equally, 1 ~67672 a correction of the lenticular in an oval form can be ground into the base lens of e.g. sph. -l,0 - cyl. - 3,0.
In order to make now the edge 2a of the lenticular ground-out portion invisible, the same will be progressively polished with a hard rubber or a similar flexible material (see fig. 4 and 5).
Another possibility how to produce the lenticular ground-out portion and its continuous transition into the base lens is to provide a proper grinding tool for each correction corresponding exactly to the definite form of the lenticular ground-out portion and the base lens. The transi-tion of the lenticular ground-out portion into the base lens will be also here automatically progressively polished. That means that the curve runs out aspherically into approx. -3,0 dptr. at the outgoing section of the optically effective zone (lenticular ground-out portion).
The grinding tools can be flattened from the lenti-cular ground-out portion over the minus lens to the peripheral rim la in a planar to positive way. In this way the thickness of the peripheral rim and so the weight of the eyeglass lenses will be still more reduced (see fig. 5) With the astigmatic eyeglass lenses the cylinder will be applied to the front face of the base lens; thus e.g. a circular lenticular ground-out portion will be maintained.
The above described eyeglass lens having a smaller lenticular ground-out portion than the lenticular ground-out portion of the known eyeglass lenses is substantially thinner and therefore lighter than the eyeglass lenses of the customary type. As it is known, a heavy correction of the eyeglass lens brings along with it chromatic or spherical aberrations, curvatures of image field etc., as soon as the eye leaves the optical center. Thus, the 1 16767`2 peripheral zones of each strong eyeglass lens are not utilized. The forfeit of the field of vision with the above described eyeqlass lenses is not felt to be in-convenient. It has already earlier turned out that even small lenticular ground-out portions do not work out in a negative sense provided that they are brought closely in front of the eye.
The esthetic effect noticeable by an observer is satisfactory, because the "bull's eye" effect of the eye-glass lenses of the customary type has disappeared. Theeyeglass lens brought closely in front of the eye diminishes only the same and not the face behind it. The effect has been improved in the way that a strong definite correction of the lenticular has been ground already into the negative base lens whereby also the transition of the lenticular ground-out portion into the base lens is camouflaged.
The diameter of a circular lenticular ground-out portion as well as the thickness of the base lens are in accordance with the necessary correction to be carried out with the client and have therefore to be individually determined. Accordingly, at a defficiency of sight of e.g.
-14 dptr. a base lens of - 3,0 dptr. having a sufficient central thickness is ground, which lens allows a lenticular ground-out portion of - 14,0 dptr. with a diameter of approx. 22 to 25 mm and a subsequent central thickness of approx. 0,7 mm (see fig. 3). Equally, 1 ~67672 a correction of the lenticular in an oval form can be ground into the base lens of e.g. sph. -l,0 - cyl. - 3,0.
In order to make now the edge 2a of the lenticular ground-out portion invisible, the same will be progressively polished with a hard rubber or a similar flexible material (see fig. 4 and 5).
Another possibility how to produce the lenticular ground-out portion and its continuous transition into the base lens is to provide a proper grinding tool for each correction corresponding exactly to the definite form of the lenticular ground-out portion and the base lens. The transi-tion of the lenticular ground-out portion into the base lens will be also here automatically progressively polished. That means that the curve runs out aspherically into approx. -3,0 dptr. at the outgoing section of the optically effective zone (lenticular ground-out portion).
The grinding tools can be flattened from the lenti-cular ground-out portion over the minus lens to the peripheral rim la in a planar to positive way. In this way the thickness of the peripheral rim and so the weight of the eyeglass lenses will be still more reduced (see fig. 5) With the astigmatic eyeglass lenses the cylinder will be applied to the front face of the base lens; thus e.g. a circular lenticular ground-out portion will be maintained.
The above described eyeglass lens having a smaller lenticular ground-out portion than the lenticular ground-out portion of the known eyeglass lenses is substantially thinner and therefore lighter than the eyeglass lenses of the customary type. As it is known, a heavy correction of the eyeglass lens brings along with it chromatic or spherical aberrations, curvatures of image field etc., as soon as the eye leaves the optical center. Thus, the 1 16767`2 peripheral zones of each strong eyeglass lens are not utilized. The forfeit of the field of vision with the above described eyeqlass lenses is not felt to be in-convenient. It has already earlier turned out that even small lenticular ground-out portions do not work out in a negative sense provided that they are brought closely in front of the eye.
The esthetic effect noticeable by an observer is satisfactory, because the "bull's eye" effect of the eye-glass lenses of the customary type has disappeared. Theeyeglass lens brought closely in front of the eye diminishes only the same and not the face behind it. The effect has been improved in the way that a strong definite correction of the lenticular has been ground already into the negative base lens whereby also the transition of the lenticular ground-out portion into the base lens is camouflaged.
Claims (7)
1. An eyeglass lens for the correction of nearsight-edness, comprising a base lens of highly refractive glass or other materials in which a circular or oval lenticular portion is ground out, characterized in that the base lens is a negative lens having a back face and the correction of the lenticular portion is ground into and continuous with the negative base lens on the back face.
2. The eyeglass lens of claim 1, wherein said back face of said negative base lens has a planar to positive shape in the area thereof extending from said lenticular portion towards the peripheral rim of said base lens.
3. An eyeglass lens for the correction of near-sightedness, comprising a base lens of highly refractive glass in which a circular or oval lenticular portion is grount out, wherein the base lens is negative lens having back and front faces and the correction of the lenticular portion is progressively grount into (and continuous with) the negative base lens on the back face thereof and aspherically shaped to be continuous with the base lens thereby providing a substantially imperceptible transition between the base lens and the lenticular portion.
4. The eyeglass lens of claim 3, wherein said back face of said negative base lens has a planar to positive shape in the area thereof extending from said lenticular portion towards the peripherical rim of said base lens thereby providing the peripherical rim with a reduced thickness.
5. An eyeglass lens comprising a negative base lens having front and back faces and a lenticular portion formed in only a selected area of the back face of the base lens to provide an optical correction, the lenti-cular portion being shaped aspherically by meeting the remaining portion of the negative base lens along a continuous flattened curve thereby providing a sub-stantially imperceptible transition between the base lens and the lenticular portion.
6. The eyeglass lens defined in claim 5 wherein said base lens if formed of a highly refractive glass.
7. The eyeglass lens defined in claim 6, wherein said refractive glass which forms said base lens is highlite flint.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH48/81 | 1981-01-07 | ||
| CH4881A CH634928A5 (en) | 1981-01-07 | 1981-01-07 | LENS for myopic. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1167672A true CA1167672A (en) | 1984-05-22 |
Family
ID=4178138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000393266A Expired CA1167672A (en) | 1981-01-07 | 1981-12-29 | Eyeglass lens for correction of nearsightedness |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0055878B1 (en) |
| AT (1) | ATE12989T1 (en) |
| CA (1) | CA1167672A (en) |
| CH (1) | CH634928A5 (en) |
| DE (1) | DE3170210D1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1147871B (en) * | 1982-04-30 | 1986-11-26 | Ottica Romani Srl | MYOPIA COMPENSATING LENS, ASSOCIATED OR NOT WITH ASTIGMATISM, WITH PERIMETER CORRECTIVE OR TRANSFORMER AREA OF VERGENCE, AND PROCEDURE FOR ITS MANUFACTURE |
| DE3229577A1 (en) * | 1982-08-07 | 1984-02-09 | Fa. Carl Zeiss, 7920 Heidenheim | EYEWEAR LENS FOR REALLY VISIFIC |
| BE899955A (en) * | 1984-06-19 | 1984-10-15 | Optimed Nv | METHOD FOR PRODUCING A GLASS FOR MYOPES. |
| NL8502142A (en) * | 1985-07-26 | 1987-02-16 | Optimed Nv | METHOD FOR MANUFACTURING AN EYEWEAR GLASSES. |
| DE3626905A1 (en) * | 1986-08-08 | 1988-02-11 | Wolfgang Emmel | Patent facet and its production |
| FR2906621B1 (en) * | 2006-09-28 | 2008-11-28 | Essilor Int | METHOD FOR DETERMINING AN OPHTHALMIC LENS |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL3474C (en) * | 1900-01-01 | |||
| FR2440011A1 (en) * | 1978-10-24 | 1980-05-23 | Essilor Int | OPHTHALMIC LENS, ESPECIALLY FOR FORT MYOPE |
| BE877990A (en) * | 1979-07-31 | 1979-11-16 | Draeck Optics N V | GLASSES |
-
1981
- 1981-01-07 CH CH4881A patent/CH634928A5/en not_active IP Right Cessation
- 1981-12-17 EP EP81201377A patent/EP0055878B1/en not_active Expired
- 1981-12-17 DE DE8181201377T patent/DE3170210D1/en not_active Expired
- 1981-12-17 AT AT81201377T patent/ATE12989T1/en active
- 1981-12-29 CA CA000393266A patent/CA1167672A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0055878A1 (en) | 1982-07-14 |
| EP0055878B1 (en) | 1985-04-24 |
| DE3170210D1 (en) | 1985-05-30 |
| ATE12989T1 (en) | 1985-05-15 |
| CH634928A5 (en) | 1983-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |