US4796989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opthalmological measuring apparatus
Assignee: Topcon Corp
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Filing: 1987-07-15
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Granted: 1989-01-10
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Expires: 2007-07-15
Abstract
Abstract An ophthalmological measuring apparatus is disclosed. It comprises a projecting systems for projecting a target image to the cornea and retina of an eye to be tested, respectively, a measuring optical system for being introduced a corneal reflecting beam of light and a retina reflecting beam of light from the eye, a light receiving portion for receiving the corneal reflecting beam of light and the retina reflecting beam of light through the measuring optical system and photoelectrically transferring the same, an image displaying device for displaying an image of the anterior portion of the eye based on a signal from the light receiving portion, and a calculating device for calculating and measuring a corneal configuration and an eye refractive power of the eye to be tested based on the signals of the corneal reflecting beam of light and the retina reflecting beam of light detected by the light receiving portion.
Inventors
- 👤 Yasufumi Fukuma
- 👤 Yoshinori Oana
- 👤 Akihiro Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:19
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/103; G; G01; G01M; G01M11/00; G01M11/02; G01M11/0228; G01M11/0235
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
261 words
An ophthalmological measuring apparatus comprising: (A) projecting means for projecting first and second target images to the retina and cornea of an eye to be tested, respectively; (B) anterior portion illuminating means for providing illumination to an anterior portion of the eye; (C) measuring optical means including: (1) eye refractive power measuring optical means for forming a retina reflected beam of light from said first target image reflected by said retina and projecting said retina reflected beam of light along a first optical path; (2) corneal configuration measuring optical means for forming a cornea reflected beam of light from said second target image reflected by said cornea and projecting said cornea reflected beam of light along a second optical path; and (3) anterior portion reflection means for forming an anterior portion reflected beam of light from said illumination reflected by said anterior portion of the eye; (D) light receiving means for receiving the corneal reflected beam of light, the retina reflected beam of light and the anterior portion reflected beam of light through said measuring optical means at a light receiving surface and generating a cornea image signal, a retina image signal, and an anterior portion image signal, respectively, in response thereto; (E) image displaying means for displaying an image of an anterior portion of the eye based on said anterior portion image signal from said light receiving means; and (F) calculating means for calculating a corneal configuration and an eye refractive power of the eye to be tested based on said cornea image signal and said retina image signal, respectively.
Claim 2
Dependent Claim
261 words
An ophthalmological measuring apparatus comprising: (A) projecting means for projecting first and second target images to the retina and cornea of an eye to be tested, respectively; (B) anterior portion illuminating means for providing illumination to an anterior portion of the eye; (C) measuring optical means including: (1) eye refractive power measuring optical means for forming a retina reflected beam of light from said first target image reflected by said retina and projecting said retina reflected beam of light along a first optical path; (2) corneal configuration measuring optical means for forming a cornea reflected beam of light from said second target image reflected by said cornea and projecting said cornea reflected beam of light along a second optical path; and (3) anterior portion reflection means for forming an anterior portion reflected beam of light from said illumination reflected by said anterior portion of the eye; (D) light receiving means for receiving the corneal reflected beam of light, the retina reflected beam of light and the anterior portion reflected beam of light through said measuring optical means at a light receiving surface and generating a cornea image signal, a retina image signal, and an anterior portion image signal, respectively, in response thereto; (E) image displaying means for displaying an image of an anterior portion of the eye based on said anterior portion image signal from said light receiving means; and (F) calculating means for calculating a corneal configuration and an eye refractive power of the eye to be tested based on said cornea image signal and said retina image signal, respectively.
Claim 3
Dependent Claim
54 words
An ophthalmological measuring apparatus as claimed in claim 1, wherein said second optical path provides a path for said anterior portion reflected beam of light to said light receiving means to verify the alignment, said second optical path being commonly used for introducing said cornea reflected beam of light to said light receiving means.
Claim 4
Dependent Claim
117 words
An ophthalmological measuring apparatus as claimed in claim 1, wherein said first optical path of said eye refractive power measuring optical means comprises a first optical path composing means for introducing to the eye to be tested a fixation mark image for being gazed at by the eye from a fixation mark image projecting optical means for radiating the fixation mark image, an optical path diversifying means for introducing said corneal reflecting image to said corneal configuration measuring optical means, and a second optical path composing means for directing to said light receiving surface said cornea reflected image which has been introduced to said eye refractive power measuring optical means by said corneal configuration measuring optical means.
Claim 5
Dependent Claim
22 words
An ophthalmological measuring apparatus as claimed in claim 1, wherein said image displaying means displays a calculated result of said calculating means.
References Cited (Backward Citations)
US4572628A
Cited
JPS5829446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |