Micropulsed Laser Trabeculoplasty Using Different Parameters

Study Overview
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Brief Summary
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This randomized, double blinded, clinical trial compares two different parameters setting of micropulsed laser trabeculoplasty for open angle glaucoma. Group one is treated with 1500 mW of Power, Group two with 1000 mW. The other settings (300 micron of diameter, 300 ms of duration, 15% duty cycle) are the same for both groups, and the laser is applied for 360°. The main outcome is to evaluate the IOP (IntraOcular Pressure) lowering effects of both treatments and the safety on the corneal endothelium.

Detailed Description
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This study is a randomized, double blinded, clinical trial. Eligibility criteria are: primary open angle glaucoma, pigmentary glaucoma and pseudoexfoliation glaucoma. Exclusion criteria are: secondary glaucoma, previous glaucoma surgery (not including cataract surgery as a glaucoma surgery), uncooperative patients, corneal endothelial diseases (such as Fuchs dystrophy or cornea guttata) and severely decompensated glaucoma. Both eyes of the patient are treated: each eye is allocated in a group using the closed envelopes method. Both the patient and the surgeon who performs the post laser examinations are not aware of the group allocation. The exams required before the trabeculoplasty are: best corrected visual acuity, IOP measurement, specular microscopy with corneal central thickness. The IOP is measured an hour after MLT (micropulsed laser trabeculoplasty), then on day one, at one month, at three months and six months. Best corrected visual acuity and specular microscopy are repeated at three months. Expected outcomes: to compare the IOP lowering effects between group one and two and to assess the safety of the procedure on the corneal endothelium. Secondary outcomes: decrease the number of glaucoma medications applied by the patients.

Official Title
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Micropulsed Laser Trabeculoplasty: a Randomized Double Blinded Clinical Trial Using Different Parameters

Conditions
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Glaucoma, Open-Angle

Intervention / Treatment
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* Procedure: Micropulsed laser trabeculoplasty


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Primary open angle glaucoma Pigmentary glaucoma Pseudoexfoliative glaucoma Exclusion Criteria: Secondary glaucoma Previous glaucoma surgery Severely decompensated glaucoma Corneal endothelial disease
Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 1500 mW<br>1500 mW of Power | Procedure: Micropulsed laser trabeculoplasty<br>* Trabeculoplasty<br>|
| Active Comparator: 1000 mW<br>Standard treatment, 1000 mW | Procedure: Micropulsed laser trabeculoplasty<br>* Trabeculoplasty<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| IOP lowering effect | Using a tonometer, we will evaluate the difference in intraocular pressure between baseline and after the treatment. The values will be expressed in mmHg. | Up to six months |