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

15 de setembro de 2026 atualizado por: 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.

Visão geral do estudo

Status

Ainda não está recrutando

Condições

Intervenção / Tratamento

Descrição detalhada

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.

Tipo de estudo

Intervencional

Inscrição (Estimado)

30

Estágio

  • Não aplicável

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

Estude backup de contato

Locais de estudo

    • Île-de-France Region
      • Boissise-le-Roi, Île-de-France Region, França, 77310
        • Clinique Les Trois Soleils
        • Contato:
        • Investigador principal:
          • Christophe Duret

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

18 anos e mais velhos (Adulto, Adulto mais velho)

Aceita Voluntários Saudáveis

Não

Gêneros Elegíveis para o Estudo

Tudo

Descrição

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)

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Tratamento
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição cruzada
  • Mascaramento: Solteiro

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Outro: 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.

Outro: 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.

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Change in reading speed on paper
Prazo: 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

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Change in reading accuracy on paper
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Colaboradores

Investigadores

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

Publicações e links úteis

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Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Estimado)

1 de outubro de 2026

Conclusão Primária (Estimado)

1 de junho de 2027

Conclusão do estudo (Estimado)

1 de junho de 2027

Datas de inscrição no estudo

Enviado pela primeira vez

15 de setembro de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

15 de setembro de 2026

Primeira postagem (Real)

21 de setembro de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)

21 de setembro de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

15 de setembro de 2026

Última verificação

1 de setembro de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • 2026-A00195-46
  • 26.02108.000598 (Outro identificador: SI (CPP))

Plano para dados de participantes individuais (IPD)

Planeja compartilhar dados de participantes individuais (IPD)?

NÃO

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Não

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

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