Evaluate of eye strain by multifocal soft contact lenses in VDT worker
- Conditions
- Eye strain
- Registration Number
- JPRN-jRCTs032210079
- Lead Sponsor
- Hara Naoto
- Brief Summary
The use of bifocal CL did not significantly affect fatigue and the frequency and intensity of ocular symptoms. It was also thought to be due to the fact that many patients had low severity of eye symptoms. The oblique inward deviation suggests that the participation and depth of focus of the lens are used by the subjects to relax their accommodation efforts. However, further research is needed to assess long-term adaptation to lenses.
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- Complete
- Sex
- All
- Target Recruitment
- 20
1)Written informed consent
2)Men and women aged between 35 and 50 (early presbyopia age group) who can record objective regulatory responses
3)Those who wear contact lenses on a daily basis
4)Lens power within the supply range
5)Corrected distance vision in both eyes of 1.0 and near-view stereopsis <=120sec
6)Those who do desk work / VDT all day during working hours
*1Excludes watching TV, smartphones, etc. at home.
1)Already wear Dailies Total1 bifocal contact lenses on a daily basis
2)Prone to develop severe dry eye, keratoconjunctivitis, etc.
3)Suffering from anterior ocular infections, inflammation, abnormalities. Diseases contraindicated*1 for wearing contact lenses.
4)History of depression (because of transition from fatigue/stress to depression)
5)Judged unsuitable to the study from staff
*1Acute and subacute inflammation of the anterior segment of the eye, eye infections, uveitis,
decreased corneal perception, dry eye and lacrimal disorders that are problematic for lens wear, eyelid abnormalities, allergic diseases that affect lens wear
Study & Design
- Study Type
- Interventional
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method Accommodation function test: Quasi-static reaction; accommodation rest, accommodation power and accommodation lag (Ar / As) are parameters.
- Secondary Outcome Measures
Name Time Method As an objective evaluation of eye strain, visual function is measured and electroencephalogram is measured. A questionnaire survey is used for subjective evaluation of fatigue.<br>1. Visual acuity with the naked eye and glasses/CL (5m and 30cm vision) <br>2. Eye position (prism cover test)<br>3. Simple EEG measurement<br>4. Use the questionnaire survey CVS-Q (Computer Vision Syndrome Questionnaire) on visual function to grasp and evaluate subjective eye strain.