US5202708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for photographic retroillumination image on eyeground
Assignee: Nidek Co Ltd
•
Filing: 1991-08-09
•
Granted: 1993-04-13
•
Expires: 2011-08-09
Abstract
Abstract A retroillumination image photographing apparatus of a crystalline lens in which an eye to be examined is projected by illumination light, and a crystalline lens is retroillumination with reflected light at an fundus of the illumination light, which includes: an alignment apparatus which aligns a photographing optical system of the retroillumination image photographing apparatus with a predetermined region of an eye to be examined; a storage apparatus which stores the position of the photographing optical system aligned by the alignment apparatus; and origin computing means which computes a specific region of the eye to be examined as an origin of an image pickup position of said photographing optical system based on the positional information of the storage apparatus; and detecting means which detects movement quantity of the image pickup position of the photographing optical system; and a display apparatus which displays the image pickup position of the photographing optical system based on the detection result of the detecting apparatus.
Inventors
- 👤 Kazuyuki Sasaki
- 👤 Nobuyuki Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:40
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/14; A61B3/15; A61B3/152
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
183 words
A retroillumination image photographing apparatus for photographing of a crystalline lens of the eye in which an illuminating light is projected on an eye to be examined along an optical axis, and said crystalline lens of the eye is retroilluminated with reflected light at a fundus of the illumination light, comprising: a photographing optical system; alignment means for aligning said photographing optical system with a predetermined region of an eye to be examined; storage means for storing an alignment position of said photographing optical system aligned by said alignment means, wherein a direction used for determining the alignment position is the direction of said optical axis; origin computing means for determining a specific region of the eye to be examined as an origin of an image pickup position of said photographing optical system based on the alignment position stored by said storage means; detecting means for detecting a movement quantity of said image pickup position of said photographing optical system; and display means for displaying said image pickup position of said photographing optical system based on the detection result of said detecting means.
Claim 2
Dependent Claim
183 words
A retroillumination image photographing apparatus for photographing of a crystalline lens of the eye in which an illuminating light is projected on an eye to be examined along an optical axis, and said crystalline lens of the eye is retroilluminated with reflected light at a fundus of the illumination light, comprising: a photographing optical system; alignment means for aligning said photographing optical system with a predetermined region of an eye to be examined; storage means for storing an alignment position of said photographing optical system aligned by said alignment means, wherein a direction used for determining the alignment position is the direction of said optical axis; origin computing means for determining a specific region of the eye to be examined as an origin of an image pickup position of said photographing optical system based on the alignment position stored by said storage means; detecting means for detecting a movement quantity of said image pickup position of said photographing optical system; and display means for displaying said image pickup position of said photographing optical system based on the detection result of said detecting means.
Claim 3
Dependent Claim
104 words
A retroillumination image photographing apparatus as claimed in claim 1, wherein said alignment means which aligns said photographing optical system with a predetermined region of an eye to be examined consists of a projection optical system which projects onto a cornea in order to form an image reflected at the cornea, an observation system for observing the image reflected at the cornea, and a sliding mechanism which moves the retroillumination image photographing optical system in an optical axis direction, and that alignment is made by adjusting so that the image reflected at the cornea and the photographing optical system have a predetermined positional relationship.
Claim 4
Dependent Claim
30 words
A retroillumination image photographing apparatus as claimed in claim 1, wherein the origin computed with the origin computing means is at the position of the image reflected from a cornea.
Claim 5
Dependent Claim
59 words
A retroillumination image photographing apparatus according to claim 1, comprising an anterior eye segment section photographing system based on Scheimpflugs principles, and origin computing means adopting an origin of an image pickup position at a vertex cornea or a facie anterior lentis position, by analyzing an anterior segment sectional image photographed by said anterior eye segment section photographing system.
Claim 6
Dependent Claim
88 words
A retroillumination image photographing apparatus as claimed in claim 1, wherein said alignment means comprises a projection optical system which projects onto a cornea in order to form an image reflected at the cornea, an observation system for observing the image reflected at the cornea, and a sliding means for moving said photographing optical system in an optical axis direction, wherein alignment is achieved by adjustment of said sliding means so that the image reflected at the cornea and the photographing optical system have a predetermined positional relationship.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |