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RecruitingNCT05600140Updated Jan 7, 2026

Viewing Strategy Training in Children With (Cerebral) Visual Impairment

An interventional study of Viewing strategy training in Vision Disorders and Vision, Low, sponsored by Royal Dutch Visio. Recruiting at 1 site in Netherlands. Open to participants aged 5 Years to 12 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-01-07.

Primary conditionVision, LowRegistry: Vision DisordersReclassifiedWhy we changed it
Registry
Vision Disorders — the first condition term the registry derived for this study.
ClinicalTrials.gg
Vision, Low
Why
  1. The study's listed conditions name Vision, Low, a narrower term within Vision Disorders.
Confidence
High: the new condition is named in the study's own listed conditions. Of 351 hand-checked studies reclassified this way, 68% were exactly right and 84% in the right disease family; the registry's first term was right for 5% (measured 2026-10-21). How we classify →
Wrong?
Tell us the study's main condition →

Sponsored by Royal Dutch Visio · Not applicable, Interventional, and Treatment

From the registry’s dates

  • Started Oct 2024; still recruiting 2 years later.
Phase
Not applicable
Study type
Interventional
Enrollment
60
Allocation
Non-randomized
Ages
5 Years to 12 Years
Sex
All
01

Study summary

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.

02

Conditions studied

  • Vision Disorders
  • Vision, Low

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Keywords

  • viewing strategies
  • (cerebral) visual impairment
  • visual rehabilitation
  • reading strategies
  • visual search strategies
03

In context

Vision, Low Reclassified

98 studies on the registry are indexed under Vision, Low; 23 are open to participants now.

This study's planned enrollment of 60 is close to the median of 60 across 78 interventional studies indexed under Vision, Low.

Browse Vision, Low studies →

Lead sponsor

This is the only study on the registry with Royal Dutch Visio as lead sponsor.

Compared within Vision, Low, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Vision Disorders. The counts are of registry records indexed under each term, refreshed daily. How we classify →

04

Who can participate

Ages eligible
5 Years to 12 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Eligibility criteria

Inclusion criteria typically developing children with normal vision:

  • 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

Inclusion criteria for children with ocular visual impairment:

  • 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

Inclusion criteria for children with cerebral visual impairment:

  • 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
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Non-randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
60 participants (estimated)

Study arms

  • Experimental
    Group A) early training group

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

    Behavioral: Viewing strategy training

  • Experimental
    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)

    Behavioral: Viewing strategy training

Interventions

  • BehavioralViewing 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.

06

What researchers measure

Primary outcomes

  1. Changes in reading accuracy after viewing strategy training

    Radner reading test

    Time frame: Group A: Day 0, Month 2, Month 8; group B: Day 0, Month 2, Month 4

  2. Changes in reading speed after viewing strategy training

    Radner reading test

    Time frame: Group A: Day 0, Month 2, Month 8; group B: Day 0, Month 2, Month 4

  3. Changes in visual search accuracy after training

    Accuracy during conjunction search

    Time frame: Group A: Day 0, Month 2, Month 8; group B: Day 0, Month 2, Month 4

  4. Changes in visual search speed after training

    Speed during conjunction search

    Time frame: Group A: Day 0, Month 2, Month 8; Group B: Day 0, Month 2, Month 4

  5. Changes in saccade amplitudes during reading and visual search after training

    Saccade amplitudes measured using Radner reading test and conjunction search

    Time frame: Group A: Day 0, Month 2, Month 8; Group B: Day 0, Month 2, Month 4

  6. Changes in fixation duration during reading and search after training

    Fixation durations measured using Radner reading test and conjunction search

    Time frame: Group A: Day 0, Month 2, Month 8; Group B: Day 0, Month 2, Month 4

  7. Changes in average distance between fixation points during conjunction search (EB-VSA) after training

    Average distance between fixation points using Radner reading test and conjunction search

    Time frame: Group A: Day 0, Month 2, Month 8; Group B: Day 0, Month 2, Month 4

Secondary outcomes

  1. Changes in WISC-V visual processing speed index (VSI) after training

    WISC-IV visual processing speed index

    Time frame: Group A: Day 0, Month 2, Month 8; Group B: Day 0, Month 2, Month 4

  2. Changes in local visual selective attention after training

    TEA-Ch Speurtocht (total number of symbols found in 1 minute)

    Time frame: Group A: Day 0, Month 2, Month 8; Group B: Day 0, Month 2, Month 4

  3. Changes in global visual selective attention after training

    Gestalt Closure (Kaufman-ABC), number of correct answers

    Time frame: Group A: Day 0, Month 2, Month 8; Group B: Day 0, Month 2, Month 4

  4. Changes in visual identification speed after training

    'DST-Plaatjes Benoemen', number of pictures correctly named within 1 minute

    Time frame: Group A: Day 0, Month 2, Month 8; Group B: Day 0, Month 2, Month 4

07

Study locations

1 of 1 sites recruiting
  • Royal Dutch Visio
    Nijmegen, Netherlands
    Recruiting
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Started Oct 2024 (actual). Primary completion is estimated for Dec 2026, 26 months after the start.

Of 38 interventional studies with no phase under Vision, Low, half reached primary completion within 25 months of starting (the median), counting those still running; a quarter within 7 and three quarters within 56. This study's planned 26 months is close to that.

How these figures are worked out, and which studies are left out of them.

Registered
Jul 12, 2022
First posted
Oct 31, 2022
StartActual
Oct 25, 2024
Primary completionEst.
Dec 2026
CompletionEst.
Dec 2026
Last update
Jan 7, 2026
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Jan 7, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT05600140
Lead sponsor
Royal Dutch Visio
Collaborators
Radboud University, Behavioural Science Institute, Nijmegen, The Netherlands
Responsible party
Sponsor
First posted
Oct 31, 2022
Start date
Oct 25, 2024
Primary completion
Dec 2026 (estimated)
Completion
Dec 2026 (estimated)
Last update
Jan 7, 2026

Study contacts

Bianca Huurneman, PhD
Contact
biancahuurneman@visio.org
0(031)646944002
Bianca Huurneman, PhD
principal investigator · Royal Dutch Visio

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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