Actively Recruiting

Phase Not Applicable
Age: 18Years +
All Genders
ID07532642

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

Age: 18Years +
All Genders

Eligibility Criteria

Eligible

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
Not Eligible

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

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Your Study Journey

Screening

Duration - 2 to 4 weeks

Participants are screened for eligibility to participate in the trial.

1 visit (in-person)

Implementation

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

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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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