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Effects of Blue-light Blocking Lens on Visual Functions

NCT02821403 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 80

Last updated 2017-04-07

Study results available
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Summary

Working Hypothesis: The blue-light blocking lens has no effect on the contrast sensitivity, accommodative response, color vision, and subjective grading of the quality of life and vision.

Purpose: To determine and compare the visual performances after wearing the blue-light blocking lenses in participants with and without presbyopia.

Methods: One hundred and sixty computer users (computer usage \>2 hours/day) with (n=120, aged \>40years) and without presbyopia (n=40, aged 18-35 years) will be recruited. Three pairs of ophthalmic lenses will be prescribed for the participants, in which one pair of them will be the blue-light blocking lenses (StressFree, Swisscoat, HK). The lenses will be used for intermediate vision (i.e., computer usage) in presbyopic group, and for distant vision in non-presbyopic group. The adaptation period for each pair of lenses will be 1 month. The pre- and post-treatment contrast sensitivity, accommodative response and color vision will be measured. The participants will also be asked to complete questionnaires about their quality of life and vision, and the performances of these ophthalmic lenses.

Significance: The blue-light blocking lens reflects the short-wavelength lights and protects the retina from "blue-light hazards"; however, blue lights are essential for various visual function and circadian rhythms. This study will evaluate the impact of the blue-light blocking lenses on visual function and quality of life, and determine whether the blue-light blocking lenses are good choices for extra ocular protection.

Conditions

  • Effects of Blue-light Blocking Lens on Visual Functions

Interventions

DEVICE

clear lens with regular coating

DEVICE

regular coating lens with yellow tint

DEVICE

clear lens with blue-light blocking coating

Sponsors & Collaborators

  • The Hong Kong Polytechnic University

    lead OTHER

Study Design

Allocation
NON_RANDOMIZED
Purpose
OTHER
Masking
SINGLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
55 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2014-07-31
Primary Completion
2015-05-31
Completion
2015-05-31

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02821403 on ClinicalTrials.gov