An interventional study of Individually Selected Active Prisms. in Developmental Dyslexia, sponsored by Lille University. Not yet recruiting at 1 site in France. Open to participants aged 18 Years to 30 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-10-09.
Sponsored by Lille University · Not applicable, Interventional, and Basic science
Developmental dyslexia is associated with persistent difficulties in reading automaticity. AUTO-DYS investigates whether a single, brief intervention using active prisms changes the complexity of nonlinear movement dynamics and reading automaticity in young adults with dyslexia. This single-center, prospective, non-randomized controlled study will enroll 66 adults aged 18-30 years: 33 with developmental dyslexia and 33 typical readers. All participants will undergo reading, postural-control, and working-memory assessments before and after an experimental period during one visit. Only participants with dyslexia will receive individually selected active prisms; typical readers will repeat the assessments without active prisms. The main hypothesis is that modifying tonic muscle distribution with active prisms is associated with increased dynamic complexity and improved reading automaticity in participants with dyslexia.
AUTO-DYS is a prospective, single-center, controlled interventional study with repeated measurements during one approximately two-hour visit. The study examines whether an acute change in tonic muscle distribution, induced by individually selected active prisms, is associated with a change in the complexity and adaptability of nonlinear dynamics and with improvements in reading, motor control and attention in young adults with developmental dyslexia.
After written informed consent and medical verification of eligibility, participants will complete proprioceptive assessments and baseline tasks: rapid word naming, silent reading with eye tracking, and single-leg standing tasks with and without working-memory demands while postural movement and gaze-related measures are recorded. Proprioceptive testing will include the podal convergence maneuver and spatial and perceptual assessments; a foveascope assessment is also performed.
In the dyslexia group, active prisms of 0.25-3 prism diopters will be selected to modify tonic muscle distribution. Participants will repeat the baseline tasks while wearing trial frames with active prisms. Typical readers will repeat the same tasks wearing their usual unmodified glasses or trial frames with plain lenses, without active prisms. The control group will provide an estimate of repeated-testing effects. The order of experimental postural tasks and assignment of reading texts will be randomized.
Analyses will examine within-participant changes and differences between groups. Repeated-measures parametric analyses are planned for normally distributed data, with non-parametric alternatives if distributional assumptions are not met. The intervention is brief and is not the complete long-term proprioceptive management program.
127 studies on the registry are indexed under Dyslexia; 27 are open to participants now.
This study's planned enrollment of 66 is below the median of 75 across 108 interventional studies indexed under Dyslexia.
Browse Dyslexia studies →Lille University is the lead sponsor of 8 studies on the registry; 7 are open to participants now.
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Adults aged 18-30 years with normal or corrected vision.
Dyslexia group: documented medical diagnosis of developmental dyslexia and an Alouette-R C index greater than two standard deviations, as specified in the protocol, on the study day.
Control group: typical readers with an Alouette-R C index less than two standard deviations, as specified in the protocol, on the study day. Eligibility will be verified by the study physician.
Exclusion Criteria:
Participants with documented developmental dyslexia will undergo assessments before and after receiving individually selected active prisms (0.25-3 prism diopters).
Device: Individually Selected Active Prisms.
Typical readers will undergo baseline and repeat assessments while wearing their usual unmodified glasses or plain trial lenses, without active prisms.
Individually selected active prisms (0.25-3 prism diopters) will be worn during post-intervention assessments by participants with dyslexia to modify tonic muscle distribution. The intervention will take place during one study visit.
Change in Detrended Fluctuation Analysis Alpha Coefficient
Change in detrended fluctuation analysis alpha coefficient (α-DFA), reflecting fractal self-similarity and the complexity and adaptability of nonlinear dynamics.
Time frame: Baseline and immediately after the intervention/control period, within the same approximately two-hour visit.
Change in High-Frequency Word Reading Effect
Change in the high-frequency word effect during silent reading, used to assess reading automaticity.
Time frame: Baseline and immediate post-test during one approximately two-hour visit.
Change in Postural Sway Path Length Measured Using the Polhemus Tracking System
Change in postural displacement path length during single-leg standing, measured using the Polhemus tracking system.
Time frame: Baseline and immediately after the intervention/control period, within the same approximately two-hour visit.
Change in Pupil Diameter
Change in pupil diameter during standing balance tasks, measured with eye tracking.
Time frame: Baseline and immediate post-test during one approximately two-hour visit.
Change in First Fixation Duration During Silent Reading
Change in first fixation duration during silent reading, measured with eye tracking..
Time frame: Baseline and immediate post-test during one approximately two-hour visit.
Change in Gaze Duration During Silent Reading
Change in gaze duration during silent reading, measured with eye tracking.
Time frame: Baseline and immediate post-test during one approximately two-hour visit.
Change in Total Fixation Duration During Silent Reading
Change in total fixation duration during silent reading, measured with eye tracking.
Time frame: Baseline and immediate post-test during one approximately two-hour visit.
Change in Fractal Self-Similarity of Eye Movements During Silent Reading
Change in fractal self-similarity measures of eye movements during silent reading, measured with eye tracking.
Time frame: Baseline and immediate post-test during one approximately two-hour visit.
Change in Rapid Word Naming Performance
Change in performance on the rapid word naming task.
Time frame: Baseline and immediate post-test during one approximately two-hour visit.
Change in Pseudoword Reading Performance
Change in performance on the pseudoword reading task.
Time frame: Baseline and immediate post-test during one approximately two-hour visit.
Baseline Tonic Symmetry Assessed With the Podal Convergence Maneuver
Baseline assessment of tonic symmetry using the podal convergence maneuver.
Time frame: Initial assessment during one approximately two-hour study visit, before the experimental intervention.
Baseline Visual Scotoma Index (0-12)
Baseline visual scotoma index, reported on a 0-12 scale.
Time frame: Initial assessment during one approximately two-hour study visit, before the experimental intervention.
Baseline Proprioceptive Maddox Index (0-8)
Baseline proprioceptive Maddox index, reported on a 0-8 scale.
Time frame: Initial assessment during one approximately two-hour study visit, before the experimental intervention.
Plan to share: Undecided
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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