Slow vision Slow visual processing speed
Conditions
Interventions
None listed
Sponsors
Radboud Universitair Medisch Centrum
Eligibility
Age
2 Years to 99 Years
Inclusion criteria
Inclusion criteria: Normally sighted participants (controls): a visual acuity >= 0.8, aged 4 to 60 years old., Visually impaired children: a visual acuity >= 0.05 and = 0.8, normal visual field, fine motor skills sufficient to perform the tests. Observations of ophthalmologists or optometrists of slow visual perceptual speed and/or complaints about slow vision, aged 4 to 17 years old.
Exclusion criteria
Exclusion criteria: For the normally sighted participants (controls): Fine motor skills insufficient to perform the tests., For the visually impaired children: Retinal pathology leading to a central scotoma, Diagnosis of additional mental impairments., For the children with CVI: Severe mental retardation and/or motor problems leading to problems to understand or execute all the tests used in the study., Normally sighted children with an apparent delay in perception: Fine motor skills insufficient to perform the tests.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The main parameter is the outcome of the new speed acuity tests (i.e. percentage correct answers and reaction times for the different sizes of optotypes, accumulated in a visual acuity and delay score). | — |
Secondary
| Measure | Time frame |
|---|---|
| Additional parameters are the eye movement recordings (e.g., the number of saccades needed to fixate the target, fixation stability, and saccade properties such as amplitude-duration-velocity relationships), the results of the Developmental Eye Movement test (DEM) and Useful Field of View (UFOV) and the results of the funduspicture and OCT (for the group with an apparent delay, or if already available). | — |
Countries
Netherlands
Outcome results
None listed