The Impact of Lenses on Musculoskeletal and Visual Complaints in VDU Workers With Neck Complaints

NCT02656953 | Completed

• 1 other identifier: 20150115
• Study Type: interventional
• Target: 40
• Locations: 0 countries
• Sites: N/A

Brief 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.

Conditions

Neck Pain

Keywords

VDU workers; VDU lenses; Neck complaints; Visual complaints

Outcome Measures

Primary Outcomes (2)

• Change in functionality using the Neck disability index (NDI)

  The NDI consists of ten questions concerning pain and daily living activities such as lifting, reading, driving, etc. and the maximum score is 50.

  At baseline and six months

• Change in visual complaints using the Visual Fatigue Questionnaire

  The questionnaire consists of 15 questions which have to be answered on a visual analogue scale ranging from zero to ten. It enquires eye strain, impaired vision, impaired eye surface and problems of the outside of the eyes, headache for example. The maximum score is 10.

  At baseline and six months

Secondary Outcomes (5)

• Change in muscle elasticity by using the MyotonPRO® device

  At baseline and six months

• Change in muscle stiffness by using the MyotonPRO® device

  At baseline and six months

• Change in muscle tone by using the MyotonPRO® device

  At baseline and six months

• Change in pressure pain threshold by using the WagnerTM FDX 50 hand-held pressure algometer

  At baseline and six months

• Change in head posture during a VDU task by means of 2D video analysis

  At baseline and six months

Study Arms (2)

VDU lenses

EXPERIMENTAL

VDU lenses 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. In this study Zeiss® Officelens Plus lenses with a Silhouette® frame were used.

Other: VDU lenses (Zeiss® Officelens Plus)

Progressive lenses

ACTIVE COMPARATOR

Progressive lenses or multifocal lenses provide a continuous range of focal power between near and far distances.Progressive lenses have some lens power for the intermediate zone as well, but this zone might not be large enough for comfortable and ergonomic computer work. In this study Zeiss® Multifocal Precision Plus lenses with a Silhouette® frame were used.

Other: Progressive lenses (Zeiss® Multifocal Precision Plus)

Interventions

VDU lenses (Zeiss® Officelens Plus) OTHER

The treatment group (n=22) was given progressive VDU glasses (Zeiss® Officelens Plus), specially designed for VDU work. The participants were asked to wear their new glasses for six months during computer work.

VDU lenses

Progressive lenses (Zeiss® Multifocal Precision Plus) OTHER

The comparison group (n=18) was given progressive glasses (Zeiss® Multifocal Precision Plus). The participants were asked to wear their new glasses for six months during computer work.

Progressive lenses

Eligibility Criteria

• Age: 45 Years - 65 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Minimum 4 hours a day and 20 hours a week of VDU work
• Work related neck/shoulder complaints
• Difference in spectacle correction for presbyopia and myopia of minimum 1.5 dioptres

You may not qualify if:

• Active eye disease that can't be corrected with eyeglasses
• Drugs that strongly influence eye or muscle function

Sponsors & Collaborators

• University Ghent: lead

MeSH Terms

Conditions

Neck Pain

Condition Hierarchy (Ancestors)

Pain; Neurologic Manifestations; Signs and Symptoms; Pathological Conditions, Signs and Symptoms

Study Officials

• Barbara Cagnie, PhD

  University Ghent

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: INVESTIGATOR
• Purpose: OTHER
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: December 18, 2015
• First Posted: January 15, 2016
• Study Start: March 1, 2015
• Primary Completion: December 1, 2015
• Study Completion: May 1, 2016
• Last Updated: December 8, 2022

Record last verified: 2022-12

Data Sharing

• IPD Sharing: Will not share