Patent US6180312B1 successfully refreshed from Google Patents.
US4664490A
Expired / Lapsed
US
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Contact lens for ophthalmoscopy and ophthalmotherapy by means of laser beam
Assignee: Haag Streit AG
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Filing: 1985-05-02
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Granted: 1987-05-12
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Expires: 2005-05-02
Abstract
Abstract The invention concerns a contact lens for observation or treatment by irradiation of the eye, in particular the anterior chamber, outside of the optical axis of the eye. The contact lens comprises a Goldmann or Roussel lens having an entrance face which is flat or spherical, a spherical exit face which is applied to the cornea of the eye, a reflecting face and a compensating element, for example a plano-cylindrical lens. The compensating element is fixed on the reflecting face and its function is to create an astigmatism effect which is the reverse of that of the eye, for an incident light beam which enters by way of the entrance face. The contact lens permits highly accurate focusing of the beam on the apex inside the eye, which is particularly useful in ophthalmoscopy and ophthalmotherapy by means of a laser beam.
Inventors
- 👤 Pascal Rol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:05
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/008; A61F9/009; A61B; A61B3/00; A61B3/10; A61B3/117; G; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A contact lens for observation and treatment of the eye by means of a light beam, said contact lens comprising an entrance face by way of which the beam enters, an exit face for application to the cornea of the eye and by way of which the beam issues towards a working point within the eye, and a reflecting face effective by total internal reflection to divert the beam entering at the entrance face towards the exit face, said reflecting face having a curved surface for creating in the contact lens an astigmatism effect which is the reverse of an astigmatism defect of the eye.
Claim 2
Dependent Claim
105 words
A contact lens for observation and treatment of the eye by means of a light beam, said contact lens comprising an entrance face by way of which the beam enters, an exit face for application to the cornea of the eye and by way of which the beam issues towards a working point within the eye, and a reflecting face effective by total internal reflection to divert the beam entering at the entrance face towards the exit face, said reflecting face having a curved surface for creating in the contact lens an astigmatism effect which is the reverse of an astigmatism defect of the eye.
Claim 3
Dependent Claim
48 words
A contact lens according to claim 1, wherein a principal element is a Goldmann lens and the reflecting face creates the astigmatism defect for an incident light beam which is perpendicular to the entrance face and which impinges on the lens on the side of the reflecting face.
Claim 4
Dependent Claim
48 words
A contact lens according to claim 1, wherein a principal element is a Roussel lens and the reflecting face creates the astigmatism defect for an incident light beam which is perpendicular to the entrance face and which impinges on the lens on the side of the reflecting face.
Claim 5
Dependent Claim
17 words
A contact lens according to claim 1, wherein the reflecting face is provided by a plano-cylindrical lens.
Claim 6
Dependent Claim
17 words
A contact lens according to claim 1, wherein the reflecting face is provided by a plano-toric lens.
Claim 7
Dependent Claim
25 words
A contact lens according to claim 1, wherein the entrance face, the exit face and the reflecting face are combined in a single homogenous piece.
Claim 8
Dependent Claim
108 words
A contact lens for observation and treatment of the eye by means of a light beam, said contact lens comprising: a principal element provided with an entrance face by way of which the beam enters, an exit face for application to the cornea of the eye and by way of which the beam issues towards a working point within the eye, and a reflecting face effective by total internal reflection to divert the beam entering at the entrance face towards the exit face; and, means at said reflecting face for providing an astigmatism effect for said beam which is the reverse of an astigmatism defect of the eye.
Claim 9
Dependent Claim
108 words
A contact lens for observation and treatment of the eye by means of a light beam, said contact lens comprising: a principal element provided with an entrance face by way of which the beam enters, an exit face for application to the cornea of the eye and by way of which the beam issues towards a working point within the eye, and a reflecting face effective by total internal reflection to divert the beam entering at the entrance face towards the exit face; and, means at said reflecting face for providing an astigmatism effect for said beam which is the reverse of an astigmatism defect of the eye.
References Cited (Backward Citations)
US4067646A
Cited
US4439026A
Cited
EP0059159A1
Cited
US4506962A
Cited
US4598984A
Cited
US4568157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |