NCT04967989 · University of Pittsburgh
Clarifying the Optimal Application of SLT Therapy Trial
(COAST)
What this study is about
The goal of this study is to understand if SLT performed at low energy is as effective as SLT performed at standard energy, and also to see if repeating SLT at low energy once a year will prevent or delay the need for daily eye drop medications better than waiting for SLT to wear off before repeating it.
View original scientific description
The goal of this study is to understand if SLT performed at low energy is as effective as SLT performed at standard energy, and also to see if repeating SLT at low energy once a year will prevent or delay the need for daily eye drop medications better than waiting for SLT to wear off before repeating it.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Age 18 or older and in good health
- Each eye with one of the following qualifying diagnoses (diagnoses may differ between eyes):
- High-risk ocular hypertension (OHT): IOP \> 21 mmHg without glaucomatous optic neuropathy (excavation, diffuse or focal thinning or notching of the neuroretinal rim, visible nerve fiber layer defects, or asymmetry of the vertical cup-to-disc ratio of \>0.2 between eyes)
- Mild primary open-angle glaucoma: glaucomatous optic neuropathy, visual field mean deviation better than -6.0 dB with no points in the central 5° \<15 dB (see figure on next page)
- Moderate primary open-angle glaucoma: glaucomatous optic neuropathy, visual field mean deviation equal to or worse than -6.0 dB but no worse than -12.0 dB and no central 5° points \<15 dB or mean deviation -12.0 dB or better with 1 central 5° points \<15 dB (see figure on next page).
- Each eye with BCVA 20/200 (UK 6/60) or better
Exclusion criteria
- Use of topical IOP-lowering medications for more than 6 cumulative months at any time in the past 5 years (this is a modification implemented during active enrollment)
- Any history of IOP-lowering laser (prophylactic iridotomy not included) or surgical procedure
- Advanced POAG in either eye (worse than moderate POAG as defined above)
- Glaucoma other than POAG (including pigmentary and pseudoexfoliation glaucoma) in either eye
- Mean IOP \> 35 mmHg at either the screening or baseline visit in either eye
- Narrow or closed angle (Shaffer Grade 0, 1, or 2) in either eye
- Contraindications to SLT or any other study intervention
- Any corneal pathology that would preclude accurate assessment of IOP by Goldmann tonometry in either eye
- Any intraocular surgical procedure within the past 6 months in either eye
- Inability to attend all scheduled study visits
- Pregnant or planning to become pregnant in the next 4 years
Where
- Laguna Hills, California
- Pasadena, California
- Sacramento, California
- San Francisco, California
- Sheridan, Colorado
- Lakeworth, Florida
- Chicago, Illinois
- Orland Park, Illinois
- Peoria, Illinois
- Baltimore, Maryland
- Boston, Massachusetts
- Reading, Massachusetts
And 13 more locations — see the full list below.
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Oct 2, 2025 · Source of record for eligibility and locations