- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05098236
Effect of Visual Retraining on Visual Loss Following Visual Cortical Damage
Study Overview
Status
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
New York
-
Rochester, New York, United States, 14642
- Flaum Eye Institute, University of Rochester Medical Center
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Cortically Blind Subject Inclusion Criteria:
- Subjects between the ages of 17 and 75, who have sustained damage to primary visual cortex at age 17 or later, and are rendered blind over a portion of their visual field.
- Subjects must have some intact visual cortical areas (other than primary visual cortex) in the damaged brain hemisphere. This assessment will be made from MRI or CT scans of the subject's head, which will be obtained via standard release from their neurologist.
- Subjects who demonstrate a clear deficit in either simple or complex visual perception in portions of their visual field.
- Subjects who are competent and responsible, as determined by the Principal Investigator.
- Subjects who will receive retinal electrophysiology (mfERG) testing must have a report from their ophthalmologist stating that they are able to receive dilating drops
Cortically Blind Subject Exclusion Criteria:
- Subjects who do not possess damage of primary visual cortex or its immediate afferents
- Subjects who are suffering from an active disease process involving their nervous system.
- Subjects who are unable to fixate visual targets precisely with their eyes
- Subjects who have unreliable vision fields from prior testing indicated by greater than 20% fixation losses, false positives or false negatives
- Best corrected visual acuity worse than 20/40 in either eye
- Impaired foveal sensitivity as indicated by visual field tests
- Presence of vision loss from ocular disease or disorder
- Presence of bilateral visual acuity loss from any source
- Subjects who are suffering from one-sided attentional neglect
- Subjects who have impaired auditory thresholds that would influence test results and training efficacy (all our testing and training involves sound as a cue for trial/stimulus onset or as feedback)
- Persons who lack the competence or are otherwise unable to perform the visual training exercises as directed.
Control Subject Inclusion Criteria:
- Subjects must be between the ages of 17 and 75 years of age
- Subjects must report no history of neurological disorder.
- Subjects who are competent and responsible, as determined by the Principal Investigator.
Control Subject Exclusion criteria:
- Subjects who possess damage to the visual system
- Subjects who are suffering from an active disease process involving their nervous system.
- Subjects who are unable to fixate visual targets precisely with their eyes
- Best corrected visual acuity worse than 20/40 in either eye
- Presence of vision loss from ocular disease or disorder
- Presence of bilateral visual acuity loss from any source
- Subjects who are suffering from one-sided attentional neglect
- Subjects who have impaired auditory thresholds that would influence test results and training efficacy (all our testing and training involves sound as a cue for trial/stimulus onset or as feedback)
- Persons who lack the competence or are otherwise unable to perform the visual testing/training exercises as directed.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Non-Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Placebo Comparator: Control
|
This training will take place in lab at the University of Rochester Medical Center.
Subject will perform one daily training session, consisting of 200-300 trials each.
The visual task performed repetitively will involve discriminating the direction of motion, the presence of motion, or the orientation of a visual stimulus (either a small cloud of dots or bars) located at a predetermined location in the visual field.
The computer program will automatically create a record of patient performance during each training session.
Subjects will train daily (about 30-40 minutes total), 5 to 7 days per week for at 7 - 14 days.
|
Experimental: Cortically Blind Subjects
|
A computer software and chin-rest necessary to perform visual training will be loaned to each subject to be used at home.
Subjects will perform one to two daily training sessions in their home, consisting of 200-300 trials each.
The visual task performed repetitively will involve discriminating the direction of motion, the presence of motion, or the orientation of a visual stimulus (either a small cloud of dots or bars) located at a predetermined location in the blind field.
The computer program will automatically create a record of patient performance during each home training session.
Subjects will train daily (about 40-60 minutes total), 5 to 7 days per week for at least 3 and up to 12 months at a time.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Direction Discrimination Threshold
Time Frame: Baseline, 4-months, 12-months
|
For each subject, the investigators will measure the change in ability to detect differences in the motion direction of visual stimuli relative to horizontal, measured in degrees of visual angle. These assessments will be based on what can be reliably detected at a 72-75% correct level of performance. These measures of change will be evaluated baseline and at each subsequent visit to the laboratory; minimally from baseline to 4-months, then baseline to 12-months from start of training. |
Baseline, 4-months, 12-months
|
Direction Integration Threshold
Time Frame: Baseline to 4-months, 12-months
|
This will measure the change in ability of subjects to integrate across a range of motion directions measured in degrees of visual angle. These assessments will be based on what range of motion directions can be reliably integrated at a 72-75% correct level of performance. These measures of change will be evaluated baseline and at each subsequent visit to the laboratory; minimally from baseline to 4-months, then baseline to 12-months from start of training. |
Baseline to 4-months, 12-months
|
Contrast Sensitivity for Direction
Time Frame: Baseline, 4-months, 12-months
|
Assessment of visual perception transfer to untrained psychophysical tasks of contrast sensitivity for direction discrimination. This is a change metric as transfer must be compared from pre- to post- each course of training. For each subject, the investigators will measure the ability to correctly detect the motion direction of visual stimuli that are also varying in contrast against a grey background. We will measure the luminance contrast that can be reliably detected at a 72-75% correct level of performance. These measures of change will be evaluated baseline and at each subsequent visit to the laboratory; minimally from baseline to 4-months, then baseline to 12-months from start of training. |
Baseline, 4-months, 12-months
|
Contrast Sensitivity for Static Orientation
Time Frame: Baseline, 4-months, 12-months
|
Assessment of visual perception transfer to untrained psychophysical tasks of contrast sensitivity for static orientation discrimination. This is a change metric as transfer must be compared from pre- to post- each course of training. For each subject, the investigators will measure the ability to correctly detect the orientation of non-moving visual stimuli that vary in contrast against a grey background. We will measure the luminance that can be reliably detected at a 72-75% correct level of performance. These measures of change will be evaluated baseline and at each subsequent visit to the laboratory; minimally from baseline to 4-months, then baseline to 12-months from start of training. |
Baseline, 4-months, 12-months
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Humphrey 10-2 and 24-2 perimetry
Time Frame: Baseline, 4-months, 12-months
|
The investigators will measure the change in visual sensitivity (measured in decibels) at all locations tested by the system. These measures will be evaluated at baseline and at each subsequent visit to the laboratory; minimally from baseline to 4-months, then baseline to 12-months from start of training. |
Baseline, 4-months, 12-months
|
Goldmann perimetry
Time Frame: Baseline, 4-months, 12-months
|
The investigators will measure the change in area of vision (degrees squared) as encompassed by each isopter, measured by one of 3 different light stimuli. The 3 isopters which will be compared are: I2e 1asb, 0.25 mm^2 I4e 10asb, 0.25 mm^2 V4e 1000asb, 64 mm^2 These measures will be evaluated at baseline and at each subsequent visit to the laboratory; minimally from baseline to 4-months, then baseline to 12-months from start of training. |
Baseline, 4-months, 12-months
|
MAIA Visual Field Perimetry
Time Frame: Baseline, 4-months, 12-months
|
The investigators will measure the change in visual sensitivity (measured in decibels) at all locations tested by the system. These measures will be evaluated at baseline and at each subsequent visit to the laboratory; minimally from baseline to 4-months, then baseline to 12-months from start of training. |
Baseline, 4-months, 12-months
|
Collaborators and Investigators
Sponsor
Collaborators
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
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
- STUDY00000075
- R01EY027314 (U.S. NIH Grant/Contract)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
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.
Clinical Trials on Stroke, Ischemic
-
Nordsjaellands HospitalRigshospitalet, Denmark; Metropolitan University CollegeCompletedTransient Ischemic Attack | Stroke, Ischemic | Stroke HemorrhagicDenmark
-
University of CalgaryThe George Institute for Global Health, AustraliaNot yet recruitingAcute Ischemic Stroke AIS | Stroke, Acute, Stroke Ischemic | Stroke AcuteCanada, Australia
-
Second Affiliated Hospital, School of Medicine,...Shanghai Zhongshan Hospital; First Affiliated Hospital of Wenzhou Medical University and other collaboratorsRecruitingAcute Ischemic Stroke and Transient Ischemic AttacksChina
-
Medtronic Cardiac Rhythm and Heart FailureMedtronic Bakken Research CenterCompletedCryptogenic Symptomatic Transient Ischemic Attack | Cryptogenic Ischemic StrokeNetherlands, United States, France, Belgium, Germany, Sweden, Italy, Austria, Canada, Denmark, Finland, Greece, Slovakia, Spain
-
University Hospital, BrestCompletedStroke, Ischemic | Stroke HemorrhagicFrance
-
Umbria Bioengineering TechnologiesRecruitingStroke, Ischemic | Stroke HemorrhagicItaly
-
Sheffield Teaching Hospitals NHS Foundation TrustUnknownFatigue | Stroke, Ischemic | Stroke HemorrhagicUnited Kingdom
-
BayerRecruitingAcute Non-cardioembolic Ischemic Stroke | Prevention of Ischemic Stroke | High-risk Transient Ischemic AttackUnited States, Switzerland, Belgium, Sweden, Canada, Australia, Taiwan, Spain, Korea, Republic of, Latvia, Israel, Malaysia, Greece, Japan, Turkey, Netherlands, Romania, China, United Kingdom, Portugal, Italy, Brazil, France, Slovakia, ... and more
-
University of AlbertaCompletedTransient Ischemic Attack | Minor Ischemic StrokeCanada
-
Stephanie HarrisonActive, not recruitingTransient Ischemic Attack | Stroke, IschemicUnited Kingdom
Clinical Trials on Training in the Blind Field
-
University of RochesterNational Institutes of Health (NIH)RecruitingStroke, Ischemic | Stroke Hemorrhagic | Visual Field Defect, Peripheral | Hemianopsia | Hemianopia | Quadrantanopia | Homonymous Hemianopia | Occipital Lobe Infarct | Visual Fields Hemianopsia | Vision Loss Partial | Peripheral Visual Field Defect of Both Eyes | Peripheral Visual Field Defect | Homonymous Hemianopsia and other conditionsUnited States
-
University of RochesterEnvision Solutions, LLCCompletedHemianopia | Quadrantanopia | Stroke Induced Vision LossUnited States
-
University of RochesterNot yet recruitingStroke, Ischemic | Hemianopia | Quadrantanopia | Cortical Blindness | Vision Loss Partial | Hemianopia Homonymous | Vision; Loss, Both Eyes | Stroke - Occipital InfarctionUnited States
-
University of OxfordUniversity of Rochester; University of Turin, Italy; University of Texas at AustinRecruitingHemianopsia | Hemianopia | Quadrantanopia | Stroke Induced Vision LossUnited Kingdom
-
Fondation Ophtalmologique Adolphe de RothschildTerminated
-
Medipol UniversityNot yet recruiting
-
University of VirginiaCompleted
-
Kubota Vision Inc.Completed
-
Manchester Metropolitan UniversityEuropean Society for Clinical Nutrition and MetabolismRecruitingCardiovascular Diseases | Obesity | Diabetes Mellitus, Type 2United Kingdom
-
National Institute of Cardiology, Laranjeiras,...WithdrawnObesity | Overweight | Physical ActivityBrazil