Clinical Trial Details
— Status: Completed
Administrative data
NCT number |
NCT02656953 |
Other study ID # |
20150115 |
Secondary ID |
|
Status |
Completed |
Phase |
N/A
|
First received |
|
Last updated |
|
Start date |
March 2015 |
Est. completion date |
May 2016 |
Study information
Verified date |
December 2022 |
Source |
University Ghent |
Contact |
n/a |
Is FDA regulated |
No |
Health authority |
|
Study type |
Interventional
|
Clinical Trial Summary
The aim of this study is to investigate the impact of wearing visual display units (VDU)
lenses versus progressive lenses on musculoskeletal and visual complaints in VDU workers with
work related neck complaints. This will be evaluated by means of questionnaires (Neck
Disability Index and Visual Fatigue Questionnaire), muscle tone, elasticity and stiffness,
pressure pain threshold and 2D video analysis of head posture during a VDU task.
Description:
The use of visual display units (VDU) is often accompanied by physical complaints of the
neck, shoulder, forearm and hand, especially in people who make extensive use of computers at
work. Besides this, VDU operators also experience eye discomfort and vision problems when
working with the computer for a long period.
With the increase of computer use, VDU glasses were developed. They provide a clear vision of
the intermediate zone at a distance of approximately 70 centimeters, which is closer than
distant vision at a distance of more than 2 meters (e.g. driving), but further than near
vision at a distance of 40 centimeters (e.g. reading), so the computer screen is seen clear
without the need for excessive focusing effort or bad postures. Progressive lenses have some
lens power for this intermediate zone as well, but this zone might not be large enough for
comfortable and ergonomic computer work. VDU glasses are often progressive glasses as well,
so they can be used to read and see things beyond the computer screen clear during computer
work.
The research question of this study is "What is the impact of wearing progressive VDU lenses
versus progressive lenses, for six months, on both musculoskeletal and visual complaints in
VDU workers with work related neck complaints ?"
To find an answer to this question, 40 VDU workers (men and women) with work related
neck/shoulder complaints, were recruited from a bank office where they perform predominantly
VDU work. All participants will receive information and have to sign an informed consent
form.
A questionnaire concerning visual and musculoskeletal complaints, in which the Neck
Disability Index (NDI) Questionnaire had to be completed at the beginning of the experiment.
Participants were tested with their old glasses in a landscape office while performing a 20
minute VDU task. Before and after the task, viscoelastic properties (MyotonPRO®) of the
trapezius muscle and the PPT (WagnerTM FDX 50 hand-held pressure algometer) of the trapezius
muscle, the levator scapulae muscle and the infraspinatus muscle were measured. A 2D video
analysis was performed during the task.The Forward Head Angle (FHA) and the Forward Shoulder
Angle (FSA) was measured afterwards. After this, participants were asked to fill out a short
questionnaire, in which the Visual Fatigue Questionnaire was included, every two weeks during
two months. On the 15th of June, 2015 the participants received new glasses and were asked to
wear these for six months during computer work. During this period the same short
questionnaire had to be filled out every two weeks. The test procedure will be repeated with
the new glasses after six months of wearing these. A shorter version of the first
questionnaire will be completed at the end of the experiment.