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Effects of Optokinetic Stimulation Without a Reading Task in Patients With Hemianopic Alexia (OPTO)

15 september 2026 bijgewerkt door: Clinique Les Trois Soleils

The goal of this clinical trial is to investigate whether optokinetic stimulation delivered without a reading task can improve reading performance in adults with post-stroke hemianopic alexia. The main question it aims to answer is: does optokinetic stimulation without a reading task improve reading speed more than optokinetic stimulation with a reading task? Optokinetic stimlation with a reading task is considered the standard rehabilitation. These two conditions will be administered according to a randomized crossover design to determine wether the presence or absence of a reading task influences reading outcomes.

Participants will

  • receive 4 weeks of optokinetic stimulation without a reading task and 4 weeks of optokinétic stimulation with a reading task, with the order of these two interventions determined by randomization,
  • undergo assesments of reading performance, oculomotor behavior, visual field and rehabilitation tolerability before and after each intervention period,
  • undergo a follow-up assesment 1 month after completion of the interventions.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

Stroke can cause a visual field defect known as homonymous hemianopia (HH). When this visual field loss involves the macula, the central area of vision, it may result in reading difficulties known as hemianopic alexia (HA).

The literature reports improved reading performance in these patients after repeated induction of horizontal optokinetic nystagmus (i.e., an oculomotor reflex consisting of horizontal saccades). To induce this nystagmus, previous studies have used a reading task involving text scrolling from right to left.

However, this type of exercise, which relies on reading, is cognitively demanding and may lead to frustration due to reading difficulties, fatigue, and reduced motivation and potentially the impact of rehabilitation. Therefore, the use of a non-reading task could help overcome these limitations.

The present study aims to compare the efficacy of optokinetic stimulation with reading to optokinetic stimulation without reading in patients with HA.

Studietype

Ingrijpend

Inschrijving (Geschat)

30

Fase

  • Niet toepasbaar

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Contact Back-up

Studie Locaties

    • Île-de-France Region
      • Boissise-le-Roi, Île-de-France Region, Frankrijk, 77310
        • Clinique Les Trois Soleils
        • Contact:
        • Hoofdonderzoeker:
          • Christophe Duret

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

18 jaar en ouder (Volwassen, Oudere volwassene)

Accepteert gezonde vrijwilligers

Nee

Geslachten die in aanmerking komen voor studie

Allemaal

Beschrijving

Inclusion Criteria:

  • Time since lesion > 1 month
  • Diagnosis of homonymous hemianopia post-stroke without macular sparing
  • Reading complaint and/or reading impairment
  • Proficiency in reading French
  • Agreed to give informed consent
  • Afiliated with national health insurance

Exclusion Criteria:

  • History of neurological or psychiatric disorders
  • Visual impairment of peripheral origin (i.e., related to damage to the structures of the eye or the optic nerve)
  • Uncorrected visual acuity deficit
  • Reading disorder prior to the stroke (dyslexia)
  • Instability of reading impairment
  • Instability of homonymous hemianopia
  • Major cognitive that would limit the ability of the patient to participate in the study (unilateral spatial neglect, simultanagnosia, comprehension disorder, oral expression disorder)

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Behandeling
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Crossover-opdracht
  • Masker: Enkel

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Ander: Group A

Patients receive 15 sessions of optokinetic rehabilitation with a reading task, followed by 15 sessions of optokinetic rehabilitation without an associated reading task.

The optokinetic rehabilitation sessions with reading are considered the standard of care, while optokinetic rehabilitation without an associated reading task is the experimental condition. Each patient undergoes both conditions sequentially and serves as their own control.

Participants are exposed to a horizontally moving optokinetic visual stimulus on a computer screen for 40 minutes per session. The task consists of viewing random sequences of letters scrolling from right to left. The sessions are spread out over 4 weeks, with 3 or 4 sessions per week, to achieve 10 hours (15 sessions) of optokinetic rehabilitation.

Participants are exposed to a horizontally moving optokinetic visual stimulus on a computer screen for 40 minutes per session. The task consists of reading aloud sentences scrolling from right to left. The sessions are spread out over 4 weeks, with 3 or 4 sessions per week, to achieve 10 hours (15 sessions) of optokinetic rehabilitation. The scrolling speed ranges from 85 to 275 words per minute, depending on the participant's reading accuracy.

Ander: Group B

Patients receive 15 sessions of optokinetic rehabilitation without an associated reading task, followed by 15 sessions of optokinetic rehabilitation with a reading task.

The optokinetic rehabilitation sessions with reading are considered the standard of care, while optokinetic rehabilitation without an associated reading task is the experimental condition. Each patient undergoes both conditions sequentially and serves as their own control.

Participants are exposed to a horizontally moving optokinetic visual stimulus on a computer screen for 40 minutes per session. The task consists of viewing random sequences of letters scrolling from right to left. The sessions are spread out over 4 weeks, with 3 or 4 sessions per week, to achieve 10 hours (15 sessions) of optokinetic rehabilitation.

Participants are exposed to a horizontally moving optokinetic visual stimulus on a computer screen for 40 minutes per session. The task consists of reading aloud sentences scrolling from right to left. The sessions are spread out over 4 weeks, with 3 or 4 sessions per week, to achieve 10 hours (15 sessions) of optokinetic rehabilitation. The scrolling speed ranges from 85 to 275 words per minute, depending on the participant's reading accuracy.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Change in reading speed on paper
Tijdsspanne: Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Change in the number of correctly read words per minute, assessed using the International Reading Speed Texts (IReST). For each participant, the change in reading speed will be calculated separately for the optokinetic rehabilitation condition with a reading task and for the optokinetic rehabilitation condition without a reading task. The within-participant changes obtained after each 4-week period will be pooled across the two randomized sequences and compared between conditions. A higher reading speed indicates better reading performance.

Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Change in reading accuracy on paper
Tijdsspanne: Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Change in the number and type of errors (paralexias, omissions) assessed using the International Reading Speed Texts (IReST).

Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8
Change in reading speed on screen
Tijdsspanne: Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Change in the number of correctly read words per minute, assessed using a screen-based reading task

Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8
Change in reading accuracy on screen
Tijdsspanne: Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Change in the number and type of errors (paralexias, omissions), assessed during a screen-based reading task

Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8
Change in subjective reading abilities
Tijdsspanne: Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Change in the score on the Hemianopia Reading Questionnaire (HRQ)

Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8
Change in ocular fixations during reading
Tijdsspanne: Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Change in the number of fixations and in the mean fixation duration (in ms) during the screen-based reading task, assessed with an eyetracker

Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8
Change in ocular saccades during reading
Tijdsspanne: Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Change in the number and in the mean amplitude of saccades (in degrees) during the screen-based reading task, assessed with an eyetracker

Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8
Change in optokinetic nystagmus
Tijdsspanne: Baseline and at the end of both rehabilitation: Week 0 and Week 8

Change of saccade amplitude and frequency during optokinetic stimulation

Baseline and at the end of both rehabilitation: Week 0 and Week 8
Change in visual detection during standard perimetry
Tijdsspanne: Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Change in visual sensitivity (in dB) at each tested visual field location on automated static perimetry (Humphrey or Octopus)

Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8
Change in visual detection during screen-based perimetry
Tijdsspanne: Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8

Change in number of correctly detected targets and mean reaction time (in ms) at each tested visual field location on screen-based perimetry

Baseline and end of each 4-week rehabilitation period: Week 0, Week 4, and Week 8
Tolerability of rehabilitation
Tijdsspanne: Before and after each rehabilitation session

Score of fatigue, stress, and mood induced by the treatment, self-assessed using a numbered visual analogue scale

Before and after each rehabilitation session
Motivation for rehabilitation
Tijdsspanne: End of each 4-week rehabilitation period: Week 4 and Week 8

Score obtained on the Situational Motivation Scale

End of each 4-week rehabilitation period: Week 4 and Week 8

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Medewerkers

Onderzoekers

  • Hoofdonderzoeker: Christophe Duret, Clinique Les Trois Soleils, Boissise-le-Roi, France

Publicaties en nuttige links

De persoon die verantwoordelijk is voor het invoeren van informatie over het onderzoek stelt deze publicaties vrijwillig ter beschikking. Dit kan gaan over alles wat met het onderzoek te maken heeft.

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

1 oktober 2026

Primaire voltooiing (Geschat)

1 juni 2027

Studie voltooiing (Geschat)

1 juni 2027

Studieregistratiedata

Eerst ingediend

15 september 2026

Eerst ingediend dat voldeed aan de QC-criteria

15 september 2026

Eerst geplaatst (Werkelijk)

21 september 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

21 september 2026

Laatste update ingediend die voldeed aan QC-criteria

15 september 2026

Laatst geverifieerd

1 september 2026

Meer informatie

Termen gerelateerd aan deze studie

Andere studie-ID-nummers

  • 2026-A00195-46
  • 26.02108.000598 (Andere identificatie: SI (CPP))

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

NEE

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

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