The Effects of Different Outdoor Light Exposure Modes on Retinal Blood Flow

Not Applicable

Completed

• Conditions: Myopia
• Interventions: Behavioral: Weak outdoor light; Behavioral: Strong outdoor light

• Registration Number: NCT05594732
• Lead Sponsor: Shanghai Eye Disease Prevention and Treatment Center

Brief Summary

In 2020, the overall myopia rate among children and adolescents in my country was 52.7%. The COVID-19 pandemic has increased students' time of indoor eye-using, and it showed that the light exposure intensity of myopic students is lower than that of non-myopia students. Studies have found that the light wave bandwidth has a significant impact on the emmetropization of the eye, and white light can promote emmetropia more than monochromatic light. It shows that outdoor exercise has a protective effect on the occurrence and development of myopia in children and adolescents, but the specific mechanism is still unclear. Retinal blood flow is sensitive to myopic stimuli, and is a short-term indicator of the relationship between light environment and myopia. This study selected retinal blood flow as the primary outcome, aiming to compare the effects of different outdoor light exposure modes on retinal blood flow after 1 hour of intense eye use, and provide clues for the prevention and control of myopia.

Detailed Description

In 2018, eight departments including the Ministry of Education jointly issued the Implementation Plan for Comprehensive Prevention and Control of Myopia in Children and Adolescents. As of 2020, the overall myopia rate among children and adolescents in my country was 52.7%. The COVID-19 pandemic has increased students' time of indoor eye-using, and it showed that the light exposure intensity of myopic students is lower than that of non-myopia students. Studies have found that the light wave bandwidth has a significant impact on the emmetropization of the eye, and white light can promote emmetropia more than monochromatic light. It shows that outdoor exercise has a protective effect on the occurrence and development of myopia in children and adolescents, but the specific mechanism is still unclear. Retinal blood flow is sensitive to myopic stimuli, and is a short-term indicator of the relationship between light environment and myopia. Also, there is a theory that reduced choroidal blood flow causes scleral hypoxia, which leads to the development of myopia. Therefore, this study selected retinal blood flow as the primary outcome, aiming to compare the effects of different outdoor light exposure modes on retinal blood flow after 1 hour of intense eye use, and provide clues for the prevention and control of myopia.

Study Timeline

• Study Start: 2022-09-06
• Status Verified: 2022-10
• Study First Submitted: 2022-10-01
• Study First Submitted QC: 2022-10-25
• Study First Posted: 2022-10-26
• Primary Completion: 2022-10-30
• Study Completion: 2022-10-30
• Last Update Submitted: 2023-06-07
• Last Update Posted: 2023-06-08

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 81

Inclusion Criteria

• School students aged from 7 to 15, regardless of sex or gender;
• Diopter between -2.0D and 3.0D, and astigmatism not exceed 0.75D;
• No organic disease and in good general condition;
• Have obtained the consent of their parents or guardians, and can cooperate.

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Exclusion Criteria

• Suffering from amblyopia, strabismus, color weakness, congenital cataract, glaucoma and other eye diseases;
• Other circumstances judged by the investigator to be unsuitable to participate in the research.

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Weak outdoor light	Weak outdoor light	4000Lux natural light exposure
Strong outdoor light	Strong outdoor light	10000Lux natural light exposure

Primary Outcome Measures

Name	Time	Method
Retinal blood flow density after relaxing for 15 minutes	Exposing to sunlight for 15 minutes	Data collected from Optovue AngioVue OCT (macular blood data collected) for the dominant eye. The duration of relaxing was recorded by a timer.

Secondary Outcome Measures

Name	Time	Method
Retinal blood flow density changes between relaxing for 5 and 15 minutes	Retinal blood flow density after relaxing for 5 and 15 minutes	The difference in retinal blood flow density was calculated between 5 and 15 minutes.

Trial Locations

Locations (1)

Shanghai Eye Disease Prevention and Treatment Center; 🇨🇳 Shanghai, Shanghai, China