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

15. september 2026 oppdatert av: 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.

Studieoversikt

Status

Har ikke rekruttert ennå

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

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

Intervensjonell

Registrering (Antatt)

30

Fase

  • Ikke aktuelt

Kontakter og plasseringer

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Studiekontakt

Studer Kontakt Backup

Studiesteder

  • Frankrike
    • Île-de-France Region
      • Boissise-le-Roi, Île-de-France Region, Frankrike, 77310
        • Clinique Les Trois Soleils
        • Ta kontakt med:
        • Hovedetterforsker:
          • Christophe Duret

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

18 år og eldre (Voksen, Eldre voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

Alle

Beskrivelse

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)

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Behandling
  • Tildeling: Randomisert
  • Intervensjonsmodell: Crossover-oppdrag
  • Masking: Enkelt

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Annen: 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.
Annen: Optokinetic stimulation without reading task

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.

Annen: Optokinetic stimulation with reading task

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.
Annen: 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.
Annen: Optokinetic stimulation without reading task

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.

Annen: Optokinetic stimulation with reading task

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.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Change in reading speed on paper
Tidsramme: 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

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Change in reading accuracy on paper
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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

Samarbeidspartnere og etterforskere

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Sponsor

Clinique Les Trois Soleils

Samarbeidspartnere

Laboratoire Mémoire Cerveau et Cognition, Boulogne-Billancourt, France

Etterforskere

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

Publikasjoner og nyttige lenker

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Generelle publikasjoner

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Antatt)

1. oktober 2026

Primær fullføring (Antatt)

1. juni 2027

Studiet fullført (Antatt)

1. juni 2027

Datoer for studieregistrering

Først innsendt

15. september 2026

Først innsendt som oppfylte QC-kriteriene

15. september 2026

Først lagt ut (Faktiske)

21. september 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

21. september 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

15. september 2026

Sist bekreftet

1. september 2026

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • 2026-A00195-46
  • 26.02108.000598 (Annen identifikator: SI (CPP))

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