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The purpose of this study was to investigate the effects of visual fatigue and dry eye level under different correlated color temperature modes, and to evaluate the effect of new designed dynamic color temperature change modes on the improvement of visual fatigue and dry eye level.
The effect of electronic display devices on visual fatigue of human eyes was the primary evaluation index and the primary outcome index of this experiment. Secondary outcome indicators were tear film break-up time, tear lipid analysis, conjunctival congestion score and subjective visual fatigue score. Other outcome indicators were eyeblink detection, accommodative function and Schirmer test. Baseline values of the above metrics were measured separately before each group of trials and then, after 50 minutes of e-text reading, specific values of the different metrics were collected when using different color temperature modes and all valid measurements were statistically compared and analysed. To assess the effect of new designed dynamic color temperature change modes on reducing visual fatigue and dry eye symptoms.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| 6500K group | No Intervention | This is the group that performs visual evoked tasks using conventional color temperature mode of whose vaule is 6500K. In this group, the impact of the same text content on the visual fatigue and comphrehensive analysis of tear film were assessed, including but not limited to indicators such as blinking detection, visual function and so on. | |
| sigmoid change group | Experimental | This is the group that performs visual evoked tasks using dynamic color temperature change mode 1 which changes from 6500K to 4000K. In this group, the impact of the same text content on the visual fatigue and comphrehensive analysis of tear film were assessed, including but not limited to indicators such as blinking detection, visual function and so on. |
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| gradient change group | Experimental | This is the group that performs visual evoked tasks using dynamic color temperature change mode 2 which changes from 6500K to 4000K. In this group, the impact of the same text content on the visual fatigue and comphrehensive analysis of tear film were assessed, including but not limited to indicators such as blinking detection, visual function and so on. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| color temperature change mode | Behavioral | Subjects are asked to read a terminal display device for 50 minutes, featuring texts with different color temperature mode treatments. Specifically, they will read the same text content for 50 minutes with different color temperature mode. The participants will complete a total of 2 sets of tests in a random order. |
| Measure | Description | Time Frame |
|---|---|---|
| Critical flicker fusion frequency | Critical flicker fusion frequency was measured before and after the task by a flicker fusion frequency detection device to assess changes in the degree of ocular fatigue. To compare the difference in CFF after wearing anti-blue glasses with normal glasses and to evaluate the effect of anti-blue glasses in preventing asthenopia. | Participants underwent three randomized experimental conditions through study completion, an average of 1 months. For each condition, CFF test was administered at baseline (pre-experiment) and post-task,totaling six completions per participant. |
| Measure | Description | Time Frame |
|---|---|---|
| Visual fatigue | The visual fatigue questionnaire utilized in this study consists of a self-report survey with a total of 16 items. It is designed to comprehensively assess the severity of visual fatigue symptoms, with a scoring system ranging from 0 to 4. Higher scores indicate more severe symptoms, encompassing three primary domains: ocular symptoms, visual discomfort, and psychological aspects triggered by visual fatigue. |
| Measure | Description | Time Frame |
|---|---|---|
| equivalent refraction | This clinical study included testing subjects for equivalent refraction diopters, which can indirectly reflect changes in the degree of myopia in the eye after the use of VDT at close range. | Participants underwent three randomized experimental conditions through study completion, an average of 1 months. For each condition, CFF test was administered at baseline (pre-experiment) and post-task,totaling six completions per participant. |
Inclusion Criteria:
Adult population, regardless of gender.
Exclusion Criteria:
Individuals with strabismus and amblyopia exist.
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Beijing Tongren Hospitol,Capital Medical University,, Beijing, Beijing/China | Beijing | Beijing Municipality | 100730 | China |
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| ID | Term |
|---|---|
| D001248 | Asthenopia |
| D015352 | Dry Eye Syndromes |
| ID | Term |
|---|---|
| D005128 | Eye Diseases |
| D007766 | Lacrimal Apparatus Diseases |
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This study is designed with a total of three groups, where participants will sequentially and randomly undergo all the intervention procedures.
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In order to eliminate the influence of subjective factors during the examination, this study was blinded only to the participant.
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| Participants underwent three randomized experimental conditions through study completion, an average of 1 months. For each condition, visual fatigue test was administered at baseline and post-task,totaling six completions per participant. |
| tear break-up time | This clinical study included tear film breakup time measurement using keratograph-7000,OCULUS immediately after each VDT task, reflecting tear film stability, and evaluating the degree of dry eye | Participants underwent three randomized experimental conditions through study completion, an average of 1 months. For each condition, CFF test was administered at baseline (pre-experiment) and post-task,totaling six completions per participant. |
| Measurement of Accommodative Sensitivity with Flip-Chart Post-VDT Tasks | This clinical study involves the assessment of accommodative sensitivity for both monocular and binocular vision using a flip-chart immediately following each VDT task. The measurement will quantify the number of optotypes correctly identified within one minute, indicative of the subject's accommodative capacity. | Participants underwent three randomized experimental conditions through study completion, an average of 1 months. For each condition, CFF test was administered at baseline (pre-experiment) and post-task,totaling six completions per participant. |