Viewing Strategy Training in Children With (Cerebral) Visual Impairment

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Clinical Phase

NA

Total Enrollment

60 participants

Study Classification

INTERVENTIONAL

Study Start Date

2024-10-25

Study Completion Date

2026-12-31

Brief Summary

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Viewing strategies are strategies used to process visual Information. Many children with visual impairment seem to lack systematic viewing strategies. However, it is unknown how viewing strategies differ between children with normal vision and children with (cerebral) visual impairment. In addition, viewing strategy training is often adopted in clinical practice, but till date there is no scientific evidence about effectiveness of this approach.

The current project has two goals: (1) to measure viewing strategies used by children with normal vision, children with ocular visual impairment and children with CVI, and (2) to evaluate whether training viewing strategies results in more efficiënt visual Information processing.

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Detailed Description

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Conditions

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Vision Disorders Vision, Low

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

PARALLEL

For the first phase of the study, we aim to include 48 children aged 5-12 years for each group (i.e. normal Vision, ocular visual impairment, cerebral visual impairment). For the second phase of the study 60 children with visual impairment aged 5-9 years will be included (ocular impairment: n=30, cerebral visual impairment: n=30).

In the second phase of the project, children receive a visual training of viewing strategies (six weeks, 2 times a week, 30 minutes). During the training, children are instructed to use specific viewing strategies (looking in a structured direction which fits the task at hand, zooming in and out / change of visual selective attentional field, visual discrimination). The verbal instructions and exercises are protocol based. A textbook is used to describe the reactions of the children during training.

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Group A) early training group

T0 = baseline measurement T1 = posttest (within two weeks after training) T2 = follow up measurement (6 months after training)

Group Type EXPERIMENTAL

Viewing strategy training

Intervention Type BEHAVIORAL

Children receive a visual training of viewing strategies (six weeks, 2 times a week, 30 minutes). During the training, children are instructed to use specific viewing strategies (looking in a structured direction which fits the task at hand, zooming in and out / change of visual selective attentional field, visual discrimination). The verbal instructions and exercises are protocol-based. A textbook is used to describe the reactions of the children during training.

Group B) late training group

T0 = baseline measurement T1 = test-retest reliability and natural development (over period 1 1/2-2 months after T0) T2 = posttest (within two weeks after training)

Group Type EXPERIMENTAL

Viewing strategy training

Intervention Type BEHAVIORAL

Children receive a visual training of viewing strategies (six weeks, 2 times a week, 30 minutes). During the training, children are instructed to use specific viewing strategies (looking in a structured direction which fits the task at hand, zooming in and out / change of visual selective attentional field, visual discrimination). The verbal instructions and exercises are protocol-based. A textbook is used to describe the reactions of the children during training.

Interventions

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Viewing strategy training

Children receive a visual training of viewing strategies (six weeks, 2 times a week, 30 minutes). During the training, children are instructed to use specific viewing strategies (looking in a structured direction which fits the task at hand, zooming in and out / change of visual selective attentional field, visual discrimination). The verbal instructions and exercises are protocol-based. A textbook is used to describe the reactions of the children during training.

Intervention Type BEHAVIORAL

Eligibility Criteria

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Inclusion Criteria

* Age 5-12 years
* linear distant visual acuity of 0.1 logMAR or better
* Verbal IQ above 70
* Absence of developmental disorders or psychiatric problems like ASS or AD(H)D

* Age 5-12 years
* Children with linear distance visual acuity better \<=1.3logMAR and \>0.1 logMAR
* Intact central visual field (at least \> 30 degrees)
* Children with a verbal IQ above 70
* Absence of developmental disorders or psychiatric problems like ASS or AD(H)D

* Age 5-12 years
* Linear distance visual acuity \<=0.3 logMAR
* Having the diagnosis CVI (verified by ophthalmologists)
* Children with a verbal IQ above 70
* Absence of psychiatric problems like ASS or AD(H)D

Additional inclusion criterion for study 2 (evaluating training effectiveness): children with (cerebral) visual impairment should have an indication for viewing strategy training. Training should not be indicated if children have no problems performing academic tasks (i.e. when speed and accuracy of visual processing is within the normal range). The age range for study 2 is 5-9 years.

Exclusion Criteria

* Children with VI: linear near visual acuity \>1.0 logMAR
* Children with visual field defect \< 30 degrees
* Children with a verbal IQ below 70
* Children who attended a form of vision training in the past two years
* Children with psychiatric problems like ASS or AD(H)D
* Auditory impairment or language impairments
* Major life events during training

Minimum Eligible Age

5 Years

Maximum Eligible Age

12 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes