Patent US5717481A successfully refreshed from Google Patents.
US5717481A
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US
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Perimetric measurement apparatus for measuring characteristics of X ganglion cells
Assignee: Topcon Corp
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Filing: 1995-10-20
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Granted: 1998-02-10
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Expires: 2015-10-20
Abstract
Abstract An apparatus for measuring a visual field of a patient, especially characteristics of X ganglion cells, displays a series of targets to a patient. A ramp stimulus is used to measure characteristics of X ganglion cells. A target size setting device sets targets of various sizes. A stimulus intensity changing device changes the intensity of the stimulus in accordance with the size set by the target size setting device. A response device measures the response from the patient, that is, whether the patient senses the target. A memory stores the intensity of stimulus and target size corresponding to the patient's responses.
Inventors
- 👤 Nobusuke Obata
- 👤 Satoru Niimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:09
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/024
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
109 words
An apparatus for measuring a visual field of a patient, comprising: a response device for measuring a response of the patient; a target presenting device for presenting a target for viewing by the patient, the target presenting device having a first mode and a second mode, the first mode presenting a target with a pulse stimulus for measuring a characteristic of Y ganglion cells, the second mode presenting a target with a ramp stimulus for measuring a characteristic of X ganglion cells, in the second mode, the target presenting device presenting the target at an initial stimulus based on a response received from the patient in the first mode.
Claim 2
Independent Claim
109 words
An apparatus for measuring a visual field of a patient, comprising: a response device for measuring a response of the patient; a target presenting device for presenting a target for viewing by the patient, the target presenting device having a first mode and a second mode, the first mode presenting a target with a pulse stimulus for measuring a characteristic of Y ganglion cells, the second mode presenting a target with a ramp stimulus for measuring a characteristic of X ganglion cells, in the second mode, the target presenting device presenting the target at an initial stimulus based on a response received from the patient in the first mode.
Claim 3
Dependent Claim
22 words
The apparatus according to claim 1, wherein the target presenting device generates a sequence of targets for determining characteristics of ganglion cells.
Claim 4
Dependent Claim
39 words
The apparatus according to claim 2, wherein the target presenting device generates a target having a size in a complete spatial summation region and generates a target having a size in a non-spatial summation region in the first mode.
Claim 5
Dependent Claim
30 words
The apparatus according to claim 1, further comprising a classifying means for classifying results based on a whole energy of stimulus and an intensity of stimulus in the second mode.
Claim 6
Dependent Claim
48 words
The apparatus according to claim 1, further comprising a classifying means for classifying results in the second mode into a group of constant whole threshold energy as a complete spatial summation group, or into a group of constant threshold energy per unit area as a non-spatial summation group.
Claim 7
Independent Claim
81 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets of various sizes with a ramp stimulus for viewing by the patient; a stimulus area setting device for setting a stimulus area in accordance with a size set by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to response received from the patient.
Claim 8
Independent Claim
81 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets of various sizes with a ramp stimulus for viewing by the patient; a stimulus area setting device for setting a stimulus area in accordance with a size set by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to response received from the patient.
Claim 9
Dependent Claim
23 words
The apparatus according to claim 6, wherein the target presenting device generates a sequence of targets for determining characteristics of X ganglion cells.
Claim 10
Dependent Claim
30 words
The apparatus according to claim 6, further comprising a classifying means for classifying results of said ramp stimulus based on a whole energy of stimulus and an intensity of stimulus.
Claim 11
Dependent Claim
48 words
The apparatus according to claim 6, further comprising a classifying means for classifying results of said ramp stimulus into a group of constant whole threshold energy as a complete spatial summation group, or into a group of constant threshold energy per unit area as a non-spatial summation group.
Claim 12
Independent Claim
107 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets with a varying intensity of a ramp stimulus at desired positions for viewing by the patient; a target size changing device for changing a size of targets generated by the target presenting device; a stimulus area setting device for setting a stimulus area in accordance with a position of a target to be generated by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to responses received from the patient.
Claim 13
Independent Claim
107 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets with a varying intensity of a ramp stimulus at desired positions for viewing by the patient; a target size changing device for changing a size of targets generated by the target presenting device; a stimulus area setting device for setting a stimulus area in accordance with a position of a target to be generated by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to responses received from the patient.
Claim 14
Dependent Claim
23 words
The apparatus according to claim 10, wherein the target presenting device generates a sequence of targets of determining characteristics of X ganglion cells.
Claim 15
Independent Claim
109 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets with a varying intensity of a ramp stimulus at desired positions for viewing by the patient; a target size changing device for changing a size of targets generated by the target presenting device; a stimulus area setting device for setting a stimulus area in accordance with a position and size of a target to be generated by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to responses received from the patient.
Claim 16
Independent Claim
109 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets with a varying intensity of a ramp stimulus at desired positions for viewing by the patient; a target size changing device for changing a size of targets generated by the target presenting device; a stimulus area setting device for setting a stimulus area in accordance with a position and size of a target to be generated by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to responses received from the patient.
Claim 17
Dependent Claim
23 words
The apparatus according to claim 12, wherein the target presenting device generates a sequence of targets for determining characteristics of X ganglion cells.
Claim 18
Dependent Claim
64 words
The apparatus according to claim 13, further comprising detecting means for detecting an abnormal portion of the patient's eye based on whether or not (1) an energy per unit area of the threshold with the lowest threshold of the target size larger than a receptive field is higher than (2) an energy per unit area of another threshold in a non-spatial summation area C2.
Claim 19
Independent Claim
124 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets with a varying intensity of stimulus at desired positions for viewing by the patient; a stimulus intensity changing device for changing the intensity of stimulus based on a position and size of a target generated by the target presenting device, the stimulus intensity changing device changing the intensity of the stimulus at a stimulus intensity changing rate which is slower than a response rate of Y ganglion cells and faster than a patient's fixation instability rate; a response device for measuring the response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to response received from the patient.
Claim 20
Independent Claim
124 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets with a varying intensity of stimulus at desired positions for viewing by the patient; a stimulus intensity changing device for changing the intensity of stimulus based on a position and size of a target generated by the target presenting device, the stimulus intensity changing device changing the intensity of the stimulus at a stimulus intensity changing rate which is slower than a response rate of Y ganglion cells and faster than a patient's fixation instability rate; a response device for measuring the response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to response received from the patient.
Claim 21
Dependent Claim
22 words
The apparatus according to claim 15, wherein the target presenting device generates a sequence of targets for determining characteristics of ganglion cells.
Claim 22
Dependent Claim
37 words
The apparatus according to claim 16, wherein the stimulus intensity changing device changes the intensity of stimulus at a stimulus intensity changing rate between a lower limit of 3 dB/second and an upper limit of 7.5 dB/second.
Claim 23
Dependent Claim
29 words
The apparatus according to claim 16, wherein the stimulus intensity changing device changes the intensity of stimulus over a stimulus intensity changing term between 4 seconds and 14 seconds.
Claim 24
Dependent Claim
29 words
The apparatus according to claim 16, wherein the stimulus intensity changing device changes the intensity of stimulus over a stimulus intensity changing term between 5 seconds and 9 seconds.
Claim 25
Dependent Claim
38 words
The apparatus according to claim 16, wherein the stimulus intensity changing device changes the intensity of stimulus at a stimulus intensity changing rate between a lower limit of 0.7 dB/ second and an upper limit of 7.5 dB/second.
Claim 26
Independent Claim
81 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets of various sizes with a monotonically-increasing stimulus for viewing by the patient; a stimulus area setting device for setting a stimulus area in accordance with a size set by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to responses received from the patient.
Claim 27
Independent Claim
81 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets of various sizes with a monotonically-increasing stimulus for viewing by the patient; a stimulus area setting device for setting a stimulus area in accordance with a size set by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to responses received from the patient.
Claim 28
Independent Claim
107 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets with a varying intensity of a monotonically-increasing stimulus at desired positions for viewing by the patient; a target size changing device for changing a size of targets generated by the target presenting device; a stimulus area setting device for setting a stimulus area in accordance with a position of a target to be generated by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to responses received from the patient.
Claim 29
Independent Claim
107 words
An apparatus for measuring a visual field of a patient, comprising: a target presenting device for presenting targets with a varying intensity of a monotonically-increasing stimulus at desired positions for viewing by the patient; a target size changing device for changing a size of targets generated by the target presenting device; a stimulus area setting device for setting a stimulus area in accordance with a position of a target to be generated by the target presenting device; a response device for measuring a response of the patient; and a memory for storing an intensity of stimulus and a target size corresponding to responses received from the patient.
References Cited (Backward Citations)
US5108170A
Cited
US5235360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-02-09 | 2001-08-11 | 2002-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-09 | 2005-08-11 | 2006-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-09 | 2009-08-11 | 2010-02-10 | $7700.00 | Window Closed / Lapsed |