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Subthreshold Micropulse Laser and Conventional Subthreshold Laser in Diabetic Macular Edema
Lijun Zhou1, Zijing Li2, Chuangxin Huang1
1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, 54 South Xianlie Road, Guangzhou, 510060, China.
Photodiagnosis and Photodynamic Therapy
|August 1, 2026
Summary
Subthreshold micropulse laser photocoagulation (SMLP) and conventional subthreshold laser photocoagulation (SLP) show similar effectiveness for diabetic macular edema over six months. SMLP may offer a potential for reduced retinal damage.
Area of Science:
- Ophthalmology
- Retinal Diseases
- Laser Therapy
Background:
- Diabetic macular edema (DME) is a leading cause of vision loss in diabetic patients.
- Subthreshold laser photocoagulation techniques aim to treat DME while minimizing thermal damage.
Purpose of the Study:
- To compare short-term morphological and visual function changes between subthreshold micropulse laser photocoagulation (SMLP) and conventional subthreshold laser photocoagulation (SLP) in diabetic macular edema (DME).
Main Methods:
- A prospective, paired, randomized controlled trial involving 66 eyes from 33 patients with clinically significant DME.
- Bilateral randomization to SMLP or SLP, with comprehensive ophthalmologic evaluations at baseline and 1, 3, and 6 months.
Main Results:
- No significant differences in best-corrected visual acuity (BCVA), central macular thickness (CMT), or macular sensitivity between SMLP and SLP at 6 months.
- Earlier significant reduction in CMT observed by month 3 in the SMLP group compared to the SLP group (month 6).
Conclusions:
- SMLP demonstrates comparable efficacy to conventional SLP for DME over a 6-month period.
- SMLP may potentially lead to less retinal damage compared to conventional SLP.
