Partial cortical blindness partial visual field defect
Conditions
Interventions
None listed
Sponsors
Clinical and developmental neuropsychology
Eligibility
Age
18 Years to 99 Years
Inclusion criteria
Inclusion criteria: For patients participating in the test sessions: - Homonymous visual field defect (at least a quadrantanopia, either right-sided or left-sided) due to acquired post-chiasmatic brain injury (based on binocular perimetry) - At least three months between onset HVFD and the first measurement. -Written consent including permission to obtain data from the patient file at Visio. For all subjects participating in the test sessions: - Age >=18 years. - Able to walk at least 50 meters independently or by using a cane/rollator, without a wheelchair (mobility assessment has to be possible). - Binocular visual acuity 0.5 or higher using current correction. - Eye and head mobility undisturbed in all directions. - MMSE score >= 24. The inclusion criteria to participate in the training sessions for patients with HH are: Age >= 18 years Homonymous visual field defect.
Exclusion criteria
Exclusion criteria: In the test sessions: a participant meeting any of the following criteria will be excluded from the study: - An additional visual field defect in the ipsilesional visual hemi-field. - Additional visual disturbances (e.g. impaired contrast sensitivity, diplopia, oscillopsia, metamorphopsia). - No clear neurological cause of HVFD. - An indication of severe higher order visual perception disorders, such as visual agnosia, severe unilateral neglect, or Bálint*s Syndrome. - Severe psychiatric, cognitive or visual perception disorders. - Misuse of drugs/alcohol/medication. - Severe hearing impairment: hearing aids allowed (verbal communication should be possible). - Problems with balance or orientation impairing mobility. - Impairments in understanding or communicating Dutch (spoken) language. There are no exclusion criteria for patients with HH participating in the training sessions.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Eye movement parameters: fixations (location, duration) and saccades (direction, amplitude) and task performance (e.g. number of errors, reaction time) during mobility and search tasks. | — |
Secondary
| Measure | Time frame |
|---|---|
| Neuropsychological paramters, visual parameters, and outcomes of three questionnaires and semi-structured interviews to evaluate VR + eye-tracking. | — |
Countries
Netherlands
Outcome results
None listed