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Could a common antioxidant eye drop delay corneal transplant surgery?

NCT ID NCT04440280

Disease control Sponsor: Massachusetts Eye and Ear Infirmary Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Sep 03, 2026 · Updated 3 times

Summary

This phase 2 trial is testing whether N-acetyl cysteine (NAC) eye drops can reduce oxidative stress in the eyes of people with Fuchs endothelial corneal dystrophy (FECD), a condition that often leads to corneal transplant. The study will enroll 45 adults with advanced FECD who are already scheduled for corneal transplant surgery. Participants will use NAC eye drops for 28 days before surgery, and researchers will measure hydrogen peroxide levels in eye fluid during surgery to see if the drops lower oxidative damage.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
N-acetyl cysteine (NAC) eye drops
What this could lead to
If successful, this could lead to a simple eye drop treatment that slows or prevents the need for corneal transplant surgery in Fuchs dystrophy patients.
What could go wrong
This is a small, early-phase trial with only 45 participants, so results may not apply broadly. The eye drops are used short-term before surgery, and it is unclear if they will provide lasting benefit or replace the need for surgery.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

About 45 people

The number the study aims to enrol. It can still change while the study runs.

Started

Sep 2020

Expected to finish

Apr 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

21 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Male or female ≥21 years of age at time of surgical evaluation. 2. Diagnosis of advanced FECD and visually significant cataract 3. Indication for DMEK (Descemet Membrane Endothelial Keratoplasty) with concurrent cataract surgery 4. Written informed consent obtained from subject and ability for subject to comply with the requirements of the study. 5. Willingness and ability to adhere to medication regimen Exclusion Criteria: 1. Pregnant, breastfeeding, or unwilling to practice birth control during participation in the study. 2. History of prior intraocular surgery in study eye including cataract, glaucoma and/or retina surgery 3. History of other corneal diseases, such as severe dry eye, corneal scars, pseudophakic bullous keratopathy, corneal degenerations, corneal infections 4. Use of ocular prescription medications except for lubricants, hyperosmotic agents, or ocular hypotensive agents 5. History of ocular surface infection within the past 30 days 6. Use of systemic, inhalational, or topical N-Acetylcysteine within the past 30 days 7. History of intolerance to topical N-Acetylcysteine 8. Presence of a condition or abnormality that in the opinion of the Investigator would compromise the safety of the patient or the quality of the data. \-

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Conditions

The condition(s) this trial relates to.

Fuchs' endothelial dystrophy

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Fuchs endothelial corneal dystrophy

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Massachusetts Eye and Ear Infirmary

    RECRUITING

    Boston, Massachusetts, 02114, United States

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