- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02526693
Is the RAPDx Pupillograph Able to Distinguish Between Glaucoma Subjects and Healthy Subjects?
RAPDx Pupillography for Early Detection of Glaucoma
Study Overview
Detailed Description
The RAPDx utilizes noninvasive digital, high-definition, infrared machine-vision with eye-tracking and automated blink detection technology to analyze and quantify the pupillary response to light.
During the scheduled appointment, all patients will receive an undilated fundus examination by the attending ophthalmologist. The following data will be collected; Demographic information, Visual acuity, Intraocular pressure (IOP) measured by Goldmann applanation tonometry, Disc damage likelihood scale (DDLS), Vertical cup/disc ratio, Gonioscopy (if not documented in the chart within the past 2 years) and Humphrey visual field examination.
Each participant will undergo RAPDx testing with two different testing sequences. They are separated by a 10-second resting period during which the patient is instructed to close his or her eyes. The exam may be paused at any time and re-alignment may be performed during any pause. The two testing sequences are:
- Standard Factory Setting: 0.1-second stimuli with 2-second inter-stimuli pauses;
- Custom Setting: 3-second stimuli with 1-second inter-stimuli pauses
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
Glaucoma patients:
- optic nerve damage (neuroretinal rim notch, asymmetric inter-eye cup to disc (c/d_ ratio >0.2 or disc damage likelihood scale (DDLS) >2, or absence of neuroretinal rim not due to other cause)
- glaucomatous visual field (VF) deficits (cluster of 3 or more points on pattern deviation plot depressed below 5% level, at least 1 depressed below 1% level; OR corrected pattern standard deviation/pattern standard deviation significant at P <0.05; or glaucoma hemifield test "outside normal limits") with good reliability indices (fixation losses, false-positive rate, false-negative rate each < 33%).
Healthy subjects:
- normal optic nerve exam
- normal reliable VF (Humphrey mean deviation (MD) >-2 or Octopus MD ≤0.8; fixation losses, false-positive rate, and false-negative rate each < 33%)
- open angles gonioscopy.
Exclusion Criteria:
- Abnormal ocular motility preventing binocular fixation (e.g. strabismus, nystagmus).
- Any condition preventing adequate visualization and examination of pupil or optic nerve (e.g. dense corneal opacities or lens opacities).
- Active infection of anterior or posterior segments of the eye.
- Any intraocular surgical or laser procedure within previous 4 weeks.
- Any non-glaucomatous condition causing RAPD, anisocoria or corectopia (ex. optic neuropathy, Horner's syndrome, previous iris injury due to trauma or surgery, etc.).
- Subjects under age 18 or subjects presently housed in correctional facility.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Diagnostic
- Allocation: Non-Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Other: Glaucoma Patients
Glaucoma patients recruited from Wills Eye Hospital Glaucoma Service will be tested with the relative afferent pupillary defect test (RAPDx) Pupillometer.
The noninvasive RAPDx measures the pupils response during light stimulation.
|
The Konan RAPDx (relative afferent pupillary defect) (Konan Medical USA, Irvine, CA) pupillometer utilizes digital, high-definition, infrared machine-vision with eye-tracking and automated blink detection technology to analyze and quantify pupillary response to light.
Other Names:
|
Other: Healthy Controls
Healthy subjects with no eye diseases recruited from Wills Eye Hospital Glaucoma Service staff, family and friends will be tested with the relative afferent pupillary defect test (RAPDx) Pupillometer.
The noninvasive RAPDx measures the pupils response during light stimulation.
|
The Konan RAPDx (relative afferent pupillary defect) (Konan Medical USA, Irvine, CA) pupillometer utilizes digital, high-definition, infrared machine-vision with eye-tracking and automated blink detection technology to analyze and quantify pupillary response to light.
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Amplitude Asymmetry of Pupil Constriction
Time Frame: 1 examination, one hour
|
Pupil size changes when light shines into the eyes making the diameter of the pupil smaller (constriction).
The size of the pupil's reaction to light, measured in millimeters, is the amplitude or change in diameter.
Amplitude of maximum pupil constriction (pupil size) when light is shone is compared between the right and left eyes.
Asymmetry is the difference between maximum pupil size of the two eyes.
|
1 examination, one hour
|
Latency Asymmetry of Pupil Constriction
Time Frame: 1 examination, one hour
|
Pupil size changes at different speeds when light shines into the eyes making the diameter of the pupil smaller (constriction).
The speed of the pupil's reaction to light is the latency or amount of time.
Latency of maximum pupil constriction when light is shone is compared between the right and left eyes.
Asymmetry is the difference in time it takes for maximum pupil constriction between the two eyes.
|
1 examination, one hour
|
Maximum Constriction Asymmetry Duration
Time Frame: 1 examination, one hour
|
Log difference between duration of maximum pupil constriction when light is shone into the right versus the left eye.
The duration of maximum constriction is calculated as time in milliseconds between point of maximum constriction and time when pupil amplitude has reached 50% of peak amplitude of dilation.
|
1 examination, one hour
|
Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 14-400E
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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