EP0189350A2
Expired / Lapsed
EP
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Automatic eye refractive power measuring apparatus
Assignee: Topcon Corp
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Filing: 1986-01-21
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Granted: —
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Expires: 2006-01-21
Abstract
Abstract Automatic eye refractive power measuring apparatus for automatically measuring refractive power of an eye under test by means of objective measurement. It comprises a projection system (1) for projecting a measuring target image to a retina of the eye (6) under test by invisible light; an imaging optical system (2) for imaging a reflection image of the measuring target image projected to the retina and reflected by the retina; an opto-electric detector (29) having a photosensitive surface (29a) disposed at imaging position and adapted to output electrical signal corresponding to the measuring target image formed on the photosensitive surface; display means (44) for displaying the measuring target image reflected on the retina based on the electrical signal as a visible image; and an auto-measuring portion adapted to detect focussing state of the measuring target image (46) projected to the retina based on the electrical signal and automatically calculate refractive power of the eye under test from the electrical signal.
Inventors
- 👤 Yasuo Kato
- 👤 Kiwami Horiguchi
- 👤 Shinji Wada
- 👤 Ikuo Kitao
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 19:09
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/103
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
158 words
An automatic eye refractive power measuring apparatus for automatically measuring refractive power of an eye under test by means of objective measurement comprising: a projection system (1) for projecting a measuring target image to a retina of the eye (6) under test by invisible light; an imaging optical system (2) for imaging a reflection image of the measuring target image projected to the retina and reflected by the retina; an opto-electric detector (29) having a photosensitive surface (29a) disposed at imaging position and adapted to output electrical signal corresponding to the measuring target image formed on the photosensitive surface; display means (44) fordisplaying the measuring target image reflectea on the retina based on the electrical signal as a visible image; and an auto-measuring portion adapted to detect focussing state of the measuring target image (46) projected to the retina based on tne electrical signal and automatically calculate refractive power of the eye under test from the electrical signal.
Claim 2
Dependent Claim
158 words
An automatic eye refractive power measuring apparatus for automatically measuring refractive power of an eye under test by means of objective measurement comprising: a projection system (1) for projecting a measuring target image to a retina of the eye (6) under test by invisible light; an imaging optical system (2) for imaging a reflection image of the measuring target image projected to the retina and reflected by the retina; an opto-electric detector (29) having a photosensitive surface (29a) disposed at imaging position and adapted to output electrical signal corresponding to the measuring target image formed on the photosensitive surface; display means (44) fordisplaying the measuring target image reflectea on the retina based on the electrical signal as a visible image; and an auto-measuring portion adapted to detect focussing state of the measuring target image (46) projected to the retina based on tne electrical signal and automatically calculate refractive power of the eye under test from the electrical signal.
Claim 3
Dependent Claim
196 words
An automatic eye refractive power measuring apparatus for automatically measuring refractive power of an eye under test by means of objective measurement comprising: a projection system(1) for projecting a measuring target image to a retina of the eye (6) under test by invisible light; an imaging optical system(2) for imaging a reflection image of the measuring target image projected to the retina and reflected by the retina; an opto-electric detector (29) having a photosensitive surface (29a) disposed at imaging postion and adapted to output electrical signal corresponding to the measuring target image formed on the pnotosensitive surface; display means (44)fordisplaying the measuring target image reflected on the retina based on the electrical signal as a visible image; an auto-measuring portion adapted to detect focussing state of the measuring target image (46)projected to the retina based on the electrical signal and automatically calculate refractive power of the eye under test from the electrical signal; a manual measurement portion for measuring refractive power of the eye under test by observing focussing state of tne measuring target image through said display means; and measurement mode switching means (56) for selectively switch said manual measurement portion and said auto-measurement portion.
Claim 4
Dependent Claim
196 words
An automatic eye refractive power measuring apparatus for automatically measuring refractive power of an eye under test by means of objective measurement comprising: a projection system(1) for projecting a measuring target image to a retina of the eye (6) under test by invisible light; an imaging optical system(2) for imaging a reflection image of the measuring target image projected to the retina and reflected by the retina; an opto-electric detector (29) having a photosensitive surface (29a) disposed at imaging postion and adapted to output electrical signal corresponding to the measuring target image formed on the pnotosensitive surface; display means (44)fordisplaying the measuring target image reflected on the retina based on the electrical signal as a visible image; an auto-measuring portion adapted to detect focussing state of the measuring target image (46)projected to the retina based on the electrical signal and automatically calculate refractive power of the eye under test from the electrical signal; a manual measurement portion for measuring refractive power of the eye under test by observing focussing state of tne measuring target image through said display means; and measurement mode switching means (56) for selectively switch said manual measurement portion and said auto-measurement portion.
Claim 5
Dependent Claim
32 words
An automatic eye refractive power measuring apparatus according to claim 1, wherein said display means is a television monitor for indicating the measuring target image by electrical signal from said opto-electric detector.
Claim 6
Dependent Claim
24 words
An automatic eye refractive power measuring apparatus according to claim 2, wherein said measurement mode switching means may be optionally set by manual operation.
Claim 7
Dependent Claim
29 words
An automatic eye refractive power measuring apparatus according to claim 2, wherein said measurement mode switching means is automatically switchable based on measuring result cneck in said auto-measurement portion.
Claim 8
Dependent Claim
34 words
An automatic eye refractive power measuring apparatus according to claim 2, wherein said measurement mode switching means is automatically switchable when light quantity of the measuring target image is less than a predetermined level.
Claim 9
Dependent Claim
44 words
An automatic eye refractive power measuring apparatus according to claim 2, wherein said manual measurement portion memorizes measuring result at a predetermined meridian by a measurement finish switch at the predetermined meridian and the measuring target image is automatically rotatable by a predetermined angle.
References Cited (Backward Citations)
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