Actively Recruiting
Radiographic Head and Neck Positional Changes in Response to Oculomotor Muscles Tonic Modification Using Low-powered Prismatic Lenses
Led by Lisbon Academic Medical Center - Centro Académico de Medicina de Lisboa · Updated on 2026-04-16
20
Participants Needed
1
Research Sites
N/A
Total Duration
On this page
AI-Summary
What this Trial Is About
Researchers are evaluating the short-term changes in head and neck positioning in patients with Postural Deficiency Syndrome (PDS) using low-powered prismatic lenses. This study is designed as a matched pair observation to understand how these lenses may affect posture. The investigation focuses on patients who present specific signs of PDS, including asymmetrical stance and head extension and rotation. Participants will undergo low dose biplanar radiography before treatment and again 15 minutes after applying the prismatic lenses. This intervention involves the use of low-powered prismatic lenses intended to modify oculomotor muscle tone. The study is observational with one experimental group where each participant acts as their own control through pre- and post-lens evaluations. During the study, participants will have radiographic assessments to measure changes in pelvic tilt angle, C0 inclination, cervical spinal vertical alignment, cervical lordosis, inclination of C1 and C2 vertebrae, and global spinal vertical alignment. These imaging evaluations occur from enrollment to the second radiographic evaluation on the same day. The total participation involves these radiographic scans and short-term monitoring directly related to lens application.
CONDITIONS
Brief Title
Radiographic Head and Neck Positional Changes in Response to Usage of Low-powered Prismatic Lenses
Who Can Participate
Eligibility Criteria
You may qualify if you...
- Adults aged 18 years or older
- Presentation of diagnostic criteria for Postural Deficiency Syndrome including two or more cardinal signs
- Clinical presentation of asymmetrical stance and head extension and rotation
- Presence of typical directional pseudoscotoma described in this syndrome
You will not qualify if you...
- Vision under 8/10, strabismus or nystagmus
- Previous eye or vestibular surgery
- Known disease affecting the central nervous system or inner ear
- Medication with known interference with balance and posture
- Treatment for postural and movement disorders in the previous year
AI-Screening
AI-Powered Screening
Complete this quick 3-step screening to check your eligibility
Your Study Journey
Duration - 2 to 4 weeks
Participants are screened for eligibility to participate in the trial.
1 visit (in-person)
Duration - 1 day
Participants undergo biplanar X-ray evaluations before and after applying low-powered prismatic lenses to assess head and neck positional changes.
2 visits (in-person) on the same day
Trial Site Locations
Total: 1 location
1
CAML
Lisbon, Lisbon District, Portugal
Actively Recruiting
Research Team
J
João Alves da Silva, MD
How is the study designed?
Study Type
INTERVENTIONAL
Masking
NONE
Allocation
NA
Model
SINGLE_GROUP
Primary Purpose
BASIC_SCIENCE
Number of Arms
1
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