Clinical trial NCT05594719: The Effect of Sun-like Spectrum With Different Spectrum Composition on Retinal Blood Flow
Official title: The Effect of Sun-like Spectrum With Different Spectrum Composition on Retinal Blood Flow in School Students: a Randomized Controlled Trial
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Myopia
Keywords: myopia
retinal blood flow
accommodative micro-fluctuation
artificial lighting
Lead sponsor: Shanghai Eye Disease Prevention and Treatment Center
Sponsor class: OTHER
First posted: 2022-10-26
Enrollment: 75
Sex: ALL
Minimum age (years): 7
Maximum age (years): 15
Standard ages: CHILD
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: The participants were randomly divided into the following three groups:

1. Sun-like spectrum, color temperature of 5000K, shorter-wavelength dominant;
2. Sun-like spectrum, color temperature of 5000K, wavelength proportion similar to the sunlight;
3. Sun-like spectrum, color temperature of 5000K, longer-wavelength dominant.
Primary purpose: PREVENTION

Brief summary: In 2020, the overall myopia rate among children and adolescents was 52.7% in China. 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 in addition to exposure to light intensity, the occurrence and development of myopia is also related to the color temperature and wavelength band of light. The sun-like spectrum refers to the spectrum with continuous wavelength bands. Animal experiments suggest that sun-like artificial lighting can prevent myopia, but the relationship between sun-like artificial lighting with different color temperatures and myopia is unknown. Clinical trials suggest that artificial lighting with a sun-like spectrum can delay fundus blood flow decline. One hypothesis is that reduced choroidal blood flow leads to scleral hypoxia and promotes the development of myopia. This study aims at comparing the effects of sun-like spectrum artificial lighting with different dominant wavelengths on the human eye, and providing 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 was 52.7% in China. 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 in addition to exposure to light intensity, the occurrence and development of myopia is also related to the color temperature and wavelength band of light. Animal experiments showed that the bandwidth of light had a significant effect on the emmetropia of the eye, and white light can promote emmetropia more than monochromatic light; longer-wavelength light and shorter-wavelength light can promote and inhibit the development of myopia through hyperopia and myopic defocus, respectively. At present, the artificial lighting methods on the market are mainly light emitting diode (LED), whose light spectrum is discontinuous. With the advancement of related research and lighting technology, multiple LED emission peaks and "sun-like spectrum" desk lamps have gradually appeared. The sun-like spectrum refers to the spectrum with continuous wavelength bands. Animal experiments suggest that sun-like artificial lighting can prevent myopia, but the relationship between sun-like artificial lighting with different color temperatures and myopia is unknown. Clinical trials suggest that artificial lighting with a sun-like spectrum can delay fundus blood flow decline. Fundus blood flow is sensitive to myopia stimuli, and is a short-term effect indicator of the relationship between light environment and myopia. One hypothesis is that reduced choroidal blood flow leads to scleral hypoxia and promotes the development of myopia. Therefore, in this study fundus blood flow was selected as the main research indicator, aiming to compare the effects of sun-like spectrum artificial lighting with different dominant wavelengths on the human eye, and provide clues for the prevention and control of myopia.

Eligibility criteria: 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.

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.

Primary outcomes:
measure: Retinal blood flow density after reading
timeFrame: At the timepoint after reading for 1 hour
Secondary outcomes:
measure: Accommodation ability after reading
timeFrame: At the timepoint after reading for 1 hour
Other outcomes:
Locations:
city: Shanghai
country: China
facility: Xiangui He
state: Shanghai
city: Shanghai
country: China
facility: Shanghai Eye Disease Prevention and Treatment Center
state: Shanghai
Study officials:
affiliation: Shanghai Eye Hospital
name: Xiangui He, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Mirhajianmoghadam H, Pina A, Ostrin LA. Objective and Subjective Behavioral Measures in Myopic and Non-Myopic Children During the COVID-19 Pandemic. Transl Vis Sci Technol. 2021 Sep 1;10(11):4. doi: 10.1167/tvst.10.11.4.
citation: Muralidharan AR, Lanca C, Biswas S, Barathi VA, Wan Yu Shermaine L, Seang-Mei S, Milea D, Najjar RP. Light and myopia: from epidemiological studies to neurobiological mechanisms. Ther Adv Ophthalmol. 2021 Dec 19;13:25158414211059246. doi: 10.1177/25158414211059246. eCollection 2021 Jan-Dec.
citation: Rucker F. Monochromatic and white light and the regulation of eye growth. Exp Eye Res. 2019 Jul;184:172-182. doi: 10.1016/j.exer.2019.04.020. Epub 2019 Apr 21.
citation: Baeza Moyano D, González-Lezcano RA. Pandemic of Childhood Myopia. Could New Indoor LED Lighting Be Part of the Solution? Energies. 2021;14(13):3827. doi:10.3390/en14133827
citation: 陈军, 陈友三, 王菁菁, et al. 类太阳光谱LED照明对儿童青少年视网膜血流灌注影响的随机对照临床试验. zgxxws. 2022;43(3):338-340. doi:10.16835/j.cnki.1000-9817.2022.03.005
citation: Liu Y, Wang L, Xu Y, Pang Z, Mu G. The influence of the choroid on the onset and development of myopia: from perspectives of choroidal thickness and blood flow. Acta Ophthalmol. 2021 Nov;99(7):730-738. doi: 10.1111/aos.14773. Epub 2021 Feb 7.