US4679920A
Expired / Lapsed
US
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Automatic perimeter
Assignee: Topcon Corp
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Filing: 1985-02-20
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Granted: 1987-07-14
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Expires: 2005-02-20
Abstract
Abstract An automatic perimeter automatically presenting stimuli in a plurality of conditions, in which the presentation of stimuli can be readily stopped by an operator during the presentation, and an accurate examination of eyesight is carried out in accordance with eliminating the few latest perception signals before the stimulus presentation is stopped during an examination of eyesight.
Inventors
- 👤 Shioiri Takashi
- 👤 Kobayashi Katsuhiko
- 👤 Tago Hideo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:52
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/024
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
An automatic perimeter comprising stimulus presentation means for presenting stimuli to a patient, presentation condition memory means for memorizing a plurality of presentation conditions, control means for controlling the stimulus presentation means so as to present the stimuli in accordance with the presention conditions memorized in the presentation condition memory means, response means operated by the patient for supplying perception signals responding to presented stimuli, response signal memory means for memorizing the perception signals in relation to the presentation condition thereof, output means for supplying output of the perception signals memorized in the response signal memory means, first input means for applying a plurality of first command signals to the control means, second input means adapted to cooperate with said first input means to supply second command signals which are to be applied to the control means, and function change means for changing the command signals generated by the second input means in response to the stimulus presentation condition controlled by the control means.
Claim 2
Dependent Claim
164 words
An automatic perimeter comprising stimulus presentation means for presenting stimuli to a patient, presentation condition memory means for memorizing a plurality of presentation conditions, control means for controlling the stimulus presentation means so as to present the stimuli in accordance with the presention conditions memorized in the presentation condition memory means, response means operated by the patient for supplying perception signals responding to presented stimuli, response signal memory means for memorizing the perception signals in relation to the presentation condition thereof, output means for supplying output of the perception signals memorized in the response signal memory means, first input means for applying a plurality of first command signals to the control means, second input means adapted to cooperate with said first input means to supply second command signals which are to be applied to the control means, and function change means for changing the command signals generated by the second input means in response to the stimulus presentation condition controlled by the control means.
Claim 3
Dependent Claim
28 words
An automatic perimeter in accordance with claim 1 in which the first input means comprises a cathode-ray tube displaying a plurality of control commands and a light pen.
Claim 4
Dependent Claim
18 words
An automatic perimeter in accordance with claim 1 in which the second input means comprises a manual switch.
Claim 5
Dependent Claim
33 words
An automatic perimeter in accordance with claim 1 in which the second input means includes means to start examination before beginning presentation of stimuli and to stop and restart the presentation of stimuli.
Claim 6
Dependent Claim
220 words
An automatic perimeter comprising stimulus presentation means for presenting stimuli in a plurality of conditions, presentation condition memory means for memorizing a presentation condition in a plurality of steps, control means for supplying presentation control signals to the stimulus presentation means in accordance with the presentation condition memorized in the presentation condition memory means, response means operated by a patient for supplying perception signals responding to presented stimuli, response signal memory means for memorizing the perception signals in relation to the presentation condition thereof, output means for supplying output of the perception signals memorized in the response signal memory means, and signal application means for supplying presentation stop signals and presentation restart signals to the control means and supplying at least one of said signals to the response signal memory means, said control means being arranged to stop supplying the presentation control signal to the stimulus presentation means on taking the presentation control signal, to return a predetermined number of presentation steps and to restart supplying the presentation control signals on taking the presentation restart signal, and means responsive to said at least one of said presentation stop and presentation restart signals for cancelling the memorized perception signals responsive to the returned presentation steps when the response memory means receives either the presentation stop signal of the presentation restart signal.
Claim 7
Dependent Claim
220 words
An automatic perimeter comprising stimulus presentation means for presenting stimuli in a plurality of conditions, presentation condition memory means for memorizing a presentation condition in a plurality of steps, control means for supplying presentation control signals to the stimulus presentation means in accordance with the presentation condition memorized in the presentation condition memory means, response means operated by a patient for supplying perception signals responding to presented stimuli, response signal memory means for memorizing the perception signals in relation to the presentation condition thereof, output means for supplying output of the perception signals memorized in the response signal memory means, and signal application means for supplying presentation stop signals and presentation restart signals to the control means and supplying at least one of said signals to the response signal memory means, said control means being arranged to stop supplying the presentation control signal to the stimulus presentation means on taking the presentation control signal, to return a predetermined number of presentation steps and to restart supplying the presentation control signals on taking the presentation restart signal, and means responsive to said at least one of said presentation stop and presentation restart signals for cancelling the memorized perception signals responsive to the returned presentation steps when the response memory means receives either the presentation stop signal of the presentation restart signal.
Claim 8
Dependent Claim
19 words
An automatic perimeter in accordance with claim 5 which further includes manual means for operating the signal application means.
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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |