Morphometric Markers of the Effectiveness of Micropulse Cyclophotocoagulation (MMEMC)

May 12, 2026 updated by: Kazakh Eye Research Institute

Morphometric Markers of the Effectiveness of Micropulse Cyclophotocoagulation: The Influence of Choroidal Thickness on the Extent and Duration of the Hypotensive Effect

This prospective study aims to evaluate morphometric markers of treatment response following micropulse transscleral cyclophotocoagulation (MP-CPC) in patients with glaucoma. The study will assess changes in choroidal thickness and the choroidal vascularity index (CVI) measured by optical coherence tomography (OCT) before treatment, 3-7 days after the procedure, and 1 month postoperatively.

Intraocular pressure (IOP) will be measured at the same time points. The correlation between changes in choroidal thickness, the choroidal vascularity index (CVI) and IOP reduction will be analyzed. Additionally, the study seeks to determine the minimal baseline choroidal thickness associated with a clinically significant hypotensive effect after MP-CPC.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

Glaucoma is a chronic progressive optic neuropathy characterized by irreversible visual field loss. Reduction of intraocular pressure (IOP) remains the only evidence-based strategy to slow disease progression. Micropulse transscleral cyclophotocoagulation (MP-CPC) has become an increasingly used laser modality due to its favorable safety profile compared to continuous-wave cyclophotocoagulation.

Despite demonstrated efficacy, the magnitude and durability of the hypotensive effect after MP-CPC vary considerably among patients. Identification of structural ocular biomarkers associated with treatment response may improve patient selection and enable a more individualized therapeutic approach.

The choroid plays a key role in ocular blood flow regulation and may influence aqueous humor dynamics, particularly uveoscleral outflow. Variations in choroidal thickness may reflect differences in vascular reactivity, tissue compliance, and structural characteristics that could modulate the biological response to laser energy.

This prospective study will include patients with various types of glaucoma scheduled to undergo MP-CPC. Subfoveal choroidal thickness and the choroidal vascularity index (CVI) will be measured using enhanced depth imaging optical coherence tomography (EDI-OCT) at three time points: Preoperatively (baseline), 3-7 days after MP-CPC, 1 month after MP-CPC Intraocular pressure will be assessed at the same time points using Corvis ST tonometry.

The primary objective of the study is to evaluate the correlation between changes in choroidal thickness, the choroidal vascularity index (CVI) and IOP reduction at early (3-7 days) and short-term (1 month) follow-up.

Secondary objectives include: Assessment of dynamic changes in choroidal thickness after MP-CPC, Evaluation of the relationship between baseline choroidal thickness and the degree of IOP reduction, Determination of a threshold (minimal) baseline choroidal thickness associated with a clinically significant hypotensive response, Safety evaluation, including changes in visual acuity and postoperative complications Correlation and regression analyses will be performed to determine whether baseline choroidal thickness and its early postoperative changes can predict the degree and stability of IOP reduction.

The identification of morphometric predictors of MP-CPC efficacy may contribute to the development of personalized treatment algorithms and improve prognostic stratification in patients undergoing laser management of glaucoma.

Study Type

Interventional

Enrollment (Estimated)

20

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • Kazakhstan
      • Almaty, Kazakhstan, 050012
        • Recruiting
        • Kazakh Eye Research Institute
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Decision to treat by MP-CPC Laser
  • Patients diagnosed with Glaucoma
  • Patients aged 18 years old and above
  • Glaucoma that is inadequately controlled on medical therapy

Exclusion Criteria:

  • Patients age less than 18 years
  • Patients unable or unwilling to provide informed consent to participate in the study
  • Patients potentially unavailable for follow up visits
  • Patients with significant scleral thinning
  • Patients with ocular infection, inflammation or intraocular surgery in the study eye 2 months prior to enrollment in the study
  • Albino patients that have no iris pigmentation

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: MicroPulse transscleral cyclophotocoagulation group
Participants in this group will undergo MicroPulse transscleral cyclophotocoagulation for glaucoma. The procedure will be performed using a laser power of 2500 mW, with a treatment duration of 100-120 seconds per hemifield and 5-6 sweeps per hemifield.
Procedure: MicroPulse transscleral cyclophotocoagulation
MicroPulse transscleral cyclophotocoagulation will be performed as a laser procedure for the treatment of glaucoma. Laser treatment will be applied transsclerally over the ciliary body using a power of 2500 mW. The treatment duration will be 100-120 seconds per hemifield, with 5-6 sweeps per hemifield.
Experimental: Conventional transscleral cyclophotocoagulation group
Participants in this group will undergo conventional transscleral cyclophotocoagulation for glaucoma. The procedure will be performed using a laser power of 1.4-2.3 W, with an exposure duration of 1.4-1.8 seconds per coagulation spot.
Procedure: Conventional transscleral cyclophotocoagulation
Conventional transscleral cyclophotocoagulation will be performed as a laser procedure for the treatment of glaucoma. Laser treatment will be applied transsclerally over the ciliary body using a power of 1.4-2.3 W, with an exposure duration of 1.4-1.8 seconds per coagulation spot.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Changes in intraocular pressure measurements between baseline and postoperative follow-up visits
Time Frame: Day 1, Day 3, Week 1, Week 2, Month 1
Baseline (pre-operative condition) and post operative intraocular pressure will be measured
Day 1, Day 3, Week 1, Week 2, Month 1

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Rate of post surgical complications
Time Frame: Day 1, Day 3, Week 1, Week 2, Months 1
Rate of post surgical complications such as Hypotony, Corneal Edema, Hyphema, Iritis, Vitreous Hemorrhage and Cystoid Macular Edema
Day 1, Day 3, Week 1, Week 2, Months 1

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Kazakh Eye Research Institute

Investigators

  • Principal Investigator: Assiya Shaikenova, MD, Kazakh Eye Research Institute

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

May 18, 2026

Primary Completion (Estimated)

August 18, 2026

Study Completion (Estimated)

August 18, 2026

Study Registration Dates

First Submitted

May 12, 2026

First Submitted That Met QC Criteria

May 12, 2026

First Posted (Actual)

May 18, 2026

Study Record Updates

Last Update Posted (Actual)

May 18, 2026

Last Update Submitted That Met QC Criteria

May 12, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 193

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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