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Updated: Feb 15, 2026

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Subthreshold microsecond laser for proliferative diabetic retinopathy: a randomized pilot study.

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Clinical Ophthalmology (Auckland, N.Z.)
|February 3, 2018
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Summary
This summary is machine-generated.

Subthreshold microsecond (STM) panretinal photocoagulation (PRP) appears non-inferior to continuous-wave laser (CWL) PRP for diabetic retinopathy. This pilot study suggests STM PRP may be a viable alternative to CWL PRP, potentially reducing complications.

Keywords:
diabetic retinopathymicropulse lasermicrosecond laserpanretinal photocoagulationproliferative diabetic retinopathy

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Area of Science:

  • Ophthalmology
  • Retinal diseases
  • Diabetic retinopathy

Background:

  • Diabetic retinopathy (DR) is a leading cause of vision loss.
  • Panretinal photocoagulation (PRP) is a standard treatment for severe DR.
  • Continuous-wave laser (CWL) PRP can cause complications.

Purpose of the Study:

  • To compare the efficacy and safety of subthreshold microsecond (STM) laser versus CWL panretinal photocoagulation (PRP).
  • To evaluate STM PRP as a potential alternative to CWL PRP for managing diabetic retinopathy.

Main Methods:

  • A randomized, prospective pilot study involving 20 eyes of 10 patients with severe non-proliferative or low-risk proliferative diabetic retinopathy.
  • Eyes were randomized to either CWL PRP or STM PRP.
  • Evaluations included fundus photography, visual field tests, and electroretinography over 9 months.

Main Results:

  • One eye in the STM group progressed to vitreous hemorrhage and required rescue treatment.
  • The CWL group showed statistically insignificant decreases in low-contrast visual acuity, visual field index, and scotopic b/a ratio compared to the STM group.

Conclusions:

  • Subthreshold microsecond (STM) panretinal photocoagulation (PRP) is non-inferior to continuous-wave laser (CWL) PRP.
  • STM PRP may serve as an alternative to CWL PRP, potentially mitigating associated complications in severe NPDR and early PDR.