Low-powered prismatic lenses to change head and neck posture
Official title: Radiographic Head and Neck Positional Changes in Response to Oculomotor Muscles Tonic Modification Using Low-powered Prismatic Lenses
Run by Lisbon Academic Medical Center - Centro Académico de Medicina de Lisboa · NCT07532642 · Data updated 2026-11-12
This will test whether wearing low-powered prismatic lenses can quickly change head and neck positioning in people with Postural Deficiency Syndrome.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 20 (estimated) |
| Sponsor | Lisbon Academic Medical Center - Centro Académico de Medicina de Lisboa Research network |
| Locations | 1 site (Lisbon, Lisbon District) |
| Status | Recruiting |
| Started | March 27, 2023 |
| Main results expected | May 31, 2026 |
| Study ends | May 31, 2026 |
| Registry record updated | April 16, 2026 |
| Trial ID | NCT07532642 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates are adults with Postural Deficiency Syndrome who show two or more cardinal signs (for example asymmetrical stance and head extension/rotation), have the typical directional pseudoscotoma, near-normal vision, and no major neurologic or vestibular conditions.
✕Probably not a fit
Patients with vision under 8/10, strabismus or nystagmus, prior eye or vestibular surgery, known central nervous system or inner ear disease, use of medications that affect balance, or those treated for postural/movement disorders in the past year are unlikely to benefit from this protocol.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
Researchers will use a matched-pair observational design to measure short-term radiographic changes in head and neck positioning after applying low-powered prismatic lenses. Participants receive low-dose biplanar radiography immediately before lens application and again 15 minutes after wearing the lenses. The study enrolls patients meeting diagnostic criteria for Postural Deficiency Syndrome, including asymmetrical stance and characteristic head extension/rotation and directional pseudoscotoma. Key exclusions include reduced vision, eye movement disorders, prior eye or vestibular surgery, central nervous system or inner ear disease, interfering medications, or recent treatment for postural disorders.
Why it matters
Potential benefit: If successful, this could offer a simple, noninvasive way to produce immediate improvements in head and neck alignment and possibly reduce postural neck pain.
How similar studies have gone: Existing evidence that prism lenses alter posture is limited to small observational reports and clinical anecdotes, and robust controlled evidence is lacking.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: Presentation of diagnostic criteria for Postural Deficiency Syndrome comprising of * Two or more cardinal signs of Postural Deficiency Syndrome * Clinical presentation of asymmetrical stance and head extension and rotation * Presence of typical directional pseudoscotoma described in this syndrome Exclusion Criteria: * Vision under 8/10, strabismus or nistagmus; * Previous eye or vestibular surgery; * Known disease affecting the central nervous system or inner ear; * Medication with known interference with balance and posture and * treatment for postural and movement disorders in the previous year.
Where it's running
-
Caml
Lisbon, Lisbon District, Portugal Recruiting
Study contacts
- Study coordinator: João Alves da Silva, MD
- Email: joao-luis@edu.ulisboa.pt
- Phone: +351935457064
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.