Study on Safety and Efficacy of Focused LED-Based Red-Light Therapy in Myopic Adults

NCT07369804 | Recruiting DMC

• 1 other identifier: HSEARS20250606001
• Study Type: interventional
• Target: 14
• Locations: 1 country
• Sites: 1

Brief Summary

This research project is a prospective, single-arm, open-label pilot study designed to evaluate the efficacy and safety of focused LED-based repeated low-level red-light (fLED-RLRL) therapy in myopic adults. The primary objective is to assess whether the therapy can increase choroidal thickness and improve choroidal blood flow. The secondary objective is to evaluate the safety and tolerability of red light therapy in adult myopes. The study will enroll 14 myopic adults aged 18 to 50 years, with spherical equivalent refractions ranging from -0.50 to -6.00 diopters. Participants will receive home-based fLED-RLRL therapy (wavelength 650 ± 10 nm, power 0.20 mW) twice daily for 3 minutes per session, 5 days per week, over a total of 28 days, combined with single-vision spectacles. The fLED red-light device employs a standard LED semiconductor chip integrated with a total internal reflection (TIR) lens and microlenses to deliver a precise and concentrated beam, enabling accurate focusing of light energy on the target area. A video tutorial will be provided to guide device usage, and support from the research team will be available throughout the study. Before the treatment, baseline data will be collected from each participant. Baseline and follow-up assessments (days 7, 14, 21, 28) will include comprehensive ophthalmic examinations: visual acuity, intraocular pressure, slit-lamp examination, autorefraction and subjective refraction, optical coherence tomography (OCT), optical coherence tomography angiography (OCTA), and posterior blood flowgraphy. These assessments will monitor structural and functional changes in the retina and choroid, as well as adverse events (e.g., retinal damage, prolonged after-images). Primary and secondary outcomes will include changes in choroidal thickness, choroidal blood flow, ocular biometric parameters, spherical equivalent refraction, and visual acuity. Additional imaging assessments, such as posterior blood flowgraphy, OCT, and OCTA scans, will also be evaluated. This pilot study aims to preliminarily explore the safety and efficacy of an fLED red-light therapy system integrated with machine vision for myopia management by analyzing choroidal parameters over a short-term treatment period. By providing a safer alternative to current laser-based therapies, this project seeks to advance the field of myopia treatment, offering a novel solution that aligns with the increasing demand for effective and safe interventions.

Conditions

Myopia

Keywords

Myopia; Red-Light Therapy; Light-Emitting Diode

Outcome Measures

Primary Outcomes (1)

• Changes in choroidal thickness measured by OCT

  Optical coherence tomography (OCT) imaging will be performed using the ultra-wide field swept-source OCT system (VG200, SVision Imaging, Ltd., Luoyang, China) to measure subfoveal choroidal thickness (SFCT).

  Choroidal thickness will be measured on baseline, days 7, 14, 21, and 28 following treatment initiation.

Secondary Outcomes (5)

• Change in axial length (AL) measured by IOLMaster 700

  Axial length will be measured on baseline, days 7, 14, 21, and 28 following treatment initiation.

• Change in Best corrected visual acuity (BCVA) using ETDRS chart

  BCVA will be measured on baseline, days 7, 14, 21, and 28 following treatment initiation.

• Change in SE measured by auto-refractor and subjective refraction

  SE will be measured on days 28 following treatment initiation.

• Change in ocular posterior segment blood flow metrics on the LSFG-NAVI

  Ocular posterior segment blood flow metrics will be measured on baseline, days 7, 14, 21, and 28 following treatment initiation.

• Change in choroidal vascularity index (CVI) measured by OCTA

  Change in choroidal vascularity index will be measured on baseline, days 7, 14, 21, and 28 following treatment initiation.

Study Arms (1)

fLED-based red-light therapy

EXPERIMENTAL

Device: fLED-based red-light therapy

Interventions

fLED-based red-light therapy DEVICE

Eligible subjects will receive fLED-based red-light therapy (650nm, 1500 lux, 0.20mW) administered twice daily (3-minute sessions per treatment, minimum 4-hour interval between sessions) over 5 consecutive weekdays, combined with SVS for a total of 28 days.

fLED-based red-light therapy

Eligibility Criteria

• Age: 18 Years - 50 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64)

You may qualify if:

• Age 18-50 years.
• SE refractions between -0.50 and -6.00 diopters (D)
• Astigmatism of 1.50 D or less.
• Best corrected monocular visual acuity better than 20/20 (Snellen equivalent).
• Willingness to provide written informed consent and comply with the treatment protocol.

You may not qualify if:

• Strabismus or binocular vision abnormalities in either eye.
• Ocular abnormalities in either eye or other systemic abnormalities.
• Previous or current use of myopia control interventions (e.g., orthokeratology, low-dose atropine, pirenzepine) within the past 6 months.
• History of ocular surgeries (e.g., cataract surgery and LASIK/SMILE).
• Afterimage time \> 5 minutes (contraindications to RLRL therapy).

Sponsors & Collaborators

• The Hong Kong Polytechnic University: lead

Study Sites (1)

The Hong Kong Polytechnic University

Hong Kong, Hong Kong, China

RECRUITING

MeSH Terms

Conditions

Myopia

Condition Hierarchy (Ancestors)

Refractive Errors; Eye Diseases

Central Study Contacts

Mingguang He

CONTACT

85234002795; mingguang.he@polyu.edu.hk

Yanxian Chen

CONTACT

85227666111; yan-xian.chen@polyu.edu.hk

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: September 19, 2025
• First Posted: January 27, 2026
• Study Start: October 8, 2025
• Primary Completion (Estimated): July 31, 2026
• Study Completion (Estimated): July 31, 2026
• Last Updated: January 27, 2026

Record last verified: 2025-09

Data Sharing

• IPD Sharing: Will not share

Locations

CN (1)