Evaluate of eye strain by multifocal soft contact lenses in VDT worker

Evaluate the effect of multifocal contact lenses on reducing asthenopia in terms of objective and subjective assessment by using near response

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-jRCTs032210079

Enrollment

Registered

2021-05-11

Start date

2021-06-03

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Eye strain

Interventions

Wear bifocal / Dailies Total1 before work and have them perform VDT work for a day. Measured from subjective and objective examination of eye strain after wearing for 2 months.

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 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.

Exclusion criteria

Exclusion criteria: 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

Design outcomes

Primary

Measure	Time frame
Accommodation function test: Quasi-static reaction; accommodation rest, accommodation power and accommodation lag (Ar / As) are parameters.	—

Secondary

Measure	Time frame
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. 1. Visual acuity with the naked eye and glasses/CL (5m and 30cm vision) 2. Eye position (prism cover test) 3. Simple EEG measurement 4. Use the questionnaire survey "CVS-Q (Computer Vision Syndrome Questionnaire)" on visual function to grasp and evaluate subjective eye strain.	—

Measure

Time frame

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. 1. Visual acuity with the naked eye and glasses/CL (5m and 30cm vision) 2. Eye position (prism cover test) 3. Simple EEG measurement 4. Use the questionnaire survey "CVS-Q (Computer Vision Syndrome Questionnaire)" on visual function to grasp and evaluate subjective eye strain.

—

Contacts

Public ContactNaoto Hara

International University of Health and Welfare

nhara@iuhw.ac.jp+81-287-24-3642

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026