US3820879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biomicroscopic eye contact glass
Assignee: Incentive Research and Development AB
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Filing: 1972-12-29
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Granted: 1974-06-28
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Expires: 1992-12-29
Abstract
Abstract A contact glass device for biomicroscopic examination of the human eye, comprises a lens body with a concave surface adapted for application upon the cornea of the eye to be examined with the optical axis of the lens coinciding with the optical axis of the eye and two light reflecting mirror surfaces disposed at the side of the lens body opposite to said concave surface so as to face each other on opposite sides of the optical axis of the lens. The two mirror surfaces are inclined at such angles relative to the optical axis of the lens body and relative to each other that it is possible to view the interior of an eye, on which the lens body is applied with its concave surface, in a non-reversed manner along a line of view which is reflected in the two mirror surfaces and passes through the lens body. In a preferred embodiment of such a contact glass device one of the two mirror surfaces is pivoted relative to the lens body so that the field of view within the interior of the eye, which is obtained along a line of view reflected in the two mirror surfaces and passing through the lens body, can by rotation of the pivoted mirror surface be moved continuously from the central portion of the fundus of the eye radially outwards to the boundary region of the fundus at the ciliary muscle.
Inventors
- 👤 L Frisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/12; A61B3/125
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A contact glass device for biomicroscopic examinations of an eye, comprising a lens body of a transparent material provided with a concave surface adapted for application upon the cornea of the eye to be examined with the axis of symmetry of the concave surface coinciding with the optical axis of the eye and having such a focal length that the interior of the eye can be viewed through the lens body by means of a microscope, a first and a second light reflecting surface located at the side of the lens body opposite to said concave surface and on opposite sides of said axis of symmetry so as to face each other with their perpendiculars parallel to a common plane containing said axis of symmetry and inclined relative said axis of symmetry in such a manner that the interior of the eye can be viewed non-reversed along a line of view which is reflected in both said reflecting surfaces and passes through the lens body.
Claim 2
Dependent Claim
165 words
A contact glass device for biomicroscopic examinations of an eye, comprising a lens body of a transparent material provided with a concave surface adapted for application upon the cornea of the eye to be examined with the axis of symmetry of the concave surface coinciding with the optical axis of the eye and having such a focal length that the interior of the eye can be viewed through the lens body by means of a microscope, a first and a second light reflecting surface located at the side of the lens body opposite to said concave surface and on opposite sides of said axis of symmetry so as to face each other with their perpendiculars parallel to a common plane containing said axis of symmetry and inclined relative said axis of symmetry in such a manner that the interior of the eye can be viewed non-reversed along a line of view which is reflected in both said reflecting surfaces and passes through the lens body.
Claim 3
Dependent Claim
117 words
A contact glass device as claimed in claim 1, wherein said first light reflecting surface is stationary relative to the lens body and said second light reflecting surface is pivoted relative to the lens body about a pivot axis which is perpendicular to said plane and located at the edge of said second reflecting surface closest to the lens body, whereby the field of view within the interior of the eye obtained along a line of view reflected in both said reflecting surfaces and passing through the lens body can be moved in substantially radial direction relative to the center of the fundus of the eye by rotation of said second reflecting surface about said pivot axis.
Claim 4
Dependent Claim
123 words
A contact glass device as claimed in claim 2, wherein said second light reflecting surface is parallel to said first light reflecting surface in the one end position of its pivot angle, whereby a line of view reflected in said two reflecting surfaces provides substantially the same field of view within the interior of the eye as a line of view passing directly through the lens body without any reflection in the reflecting surfaces, whereas in its opposite end position of its pivot angle said second reflecting surface is inclined relative to said first reflecting surface by such an angle that a line of view reflected in both said mirror surfaces makes it possible to examine the anterior chamber angle in the eye.
Claim 5
Dependent Claim
95 words
A contact glass device as claimed in claim 2, comprising a substantially tubular housing having the lens body mounted in its one end and surrounding the two light reflecting surfaces and an annular member mounted for rotation about said housing, said annular member being coupled to one end of an elongate, flexible member guided for axial displacement and said elongate member having its opposite end coupled to said second pivoted light reflecting surface so that said second reflecting surface can be pivoted about its pivot axis by rotation of said annular member about said housing.
Claim 6
Dependent Claim
94 words
A contact glass device as claimed in claim 4, wherein said elongate flexible member consists of a close-lapped coil spring, which is slipped over and axially displaceable along a rigid rod, which is stationary relative to the housing and located in an elongate peripherally extending opening in the cylindrical wall of the housing, one end of said coil spring being attached to the rear side of said rotatable second light reflecting surface and its opposite end being attached to said rotatable annular member, which covers said elongate opening in the wall of the housing.
Claim 7
Dependent Claim
23 words
A contact glass device as claimed in claim 4, wherein the opposite end of said tubular housing is closed by a transparent disc.
Claim 8
Dependent Claim
58 words
A contact glass device as claimed in claim 1, wherein said first and second light reflecting surfaces are stationary and so inclined relative each other and said axis of symmetry that the anterior chamber angle in the eye can be viewed along a line of view reflected in both said reflecting surfaces and passing through the lens body.
Claim 9
Dependent Claim
24 words
A contact glass device as claimed in claim 7, wherein said two reflecting surfaces consist of substantially totally reflecting surfaces on the lens body.
Claim 10
Dependent Claim
84 words
A contact glass device as claimed in claim 1, wherein the surface of the lens body opposite to said concave surface is planar and inclined relative to said axis of symmetry so as to have its perpendicular parallel to said common plane, which contains said axis of symmetry and is parallel to the perpendiculars of said first and second light reflecting surfaces, whereby the lens body causes also a prismatic refraction, the base of the prism being located adjacent said first light reflecting surface.
Claim 11
Dependent Claim
49 words
A contact glass device as claimed in claim 1, wherein said first and second light reflecting surfaces are disposed so as to permit observation of the interior of the eye along a line of view passing directly through the lens body without reflection in any of the reflecting surfaces.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |