Clinical trial Recruiting at 1 site Interventional Ages 18 and up

Repairing full-thickness macular holes without using gas (no endotamponade)

Official title: The No Endotamponade for Macular Hole Repair (NEMAR) Study: An International Multi-center Randomized Controlled Trial Comparing Macular Hole Closure Using Internal Limiting Membrane Flap Without Endotamponade Versus Conventional Surgery

Run by Chinese University of Hong Kong · NCT06908824 · Data updated 2026-11-12

This trial sees if an internal limiting membrane (ILM) flap technique that omits gas can close full-thickness macular holes in adults as safely and effectively as the usual vitrectomy with gas tamponade.

Quick facts

Study typeInterventional
Ages18 Years and up
SexAll
Enrollment180 (estimated)
SponsorChinese University of Hong Kong
Academic / other
Locations3 sites (Hong Kong and 2 other locations)
StatusRecruiting
StartedSeptember 16, 2025
Main results expectedDecember 31, 2027
Study endsDecember 31, 2027
Registry record updatedSeptember 30, 2025
Trial IDNCT06908824 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults (≥18 years) with an OCT-confirmed full-thickness macular hole, visual acuity between approximately 0.05 and 0.8, no prior macular surgery, and without other significant macular disease or extreme myopia are ideal candidates.

Probably not a fit

Patients with very large holes (minimum linear diameter ≥800 µm), prior macular surgery, other central maculopathies, uncontrolled glaucoma, marked myopic chorioretinal atrophy, or pregnancy are unlikely to benefit or are excluded from this approach.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This is a prospective, international, randomized controlled trial comparing two surgical approaches for full-thickness macular hole repair. One arm receives conventional pars plana vitrectomy with ILM peeling and intraocular gas tamponade plus face-down posturing, while the other arm receives an ILM flap technique with no gas and no posturing restriction. Adults with OCT-confirmed full-thickness macular holes who meet size and ocular health criteria are randomized and followed for anatomical closure and safety outcomes. The trial is conducted at multiple centers in Hong Kong, Poland, and Taiwan to capture diverse patient populations and surgical practice patterns.

Why it matters

Potential benefit: If successful, the no-gas technique could achieve comparable hole closure while sparing patients early postoperative vision impairment, face-down positioning, air-travel restrictions, and exposure to ophthalmic greenhouse gases.

How similar studies have gone: Retrospective case series and early reports have shown encouraging results for ILM flap techniques without gas, but randomized controlled data directly comparing no-gas versus conventional gas tamponade are not yet published.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Age \>= 18 years
* Presence of full thickness macular hole in one eye (defined as full thickness discontinuity of neuro-sensory retina at the macula on optical coherence tomography)
* Able to comply to post-operative posture
* VA ≥0.05 and ≤0.8

Exclusion Criteria:

* Fellow eye enrolled in the study
* Eyes that underwent previous macular surgery
* Presence of maculopathy other than macular hole, epi-retinal membrane or myopic maculopathy. For example, age-related macular degeneration, diabetic macular edema or pre-existing macular scar
* Axial length \>/= 28mm or presence of significant myopic chorio-retinal atrophy involving the fovea
* Minimum linear diameter \>/=800µm
* Presence of contraindications to intraocular gas, such as advanced glaucoma or uncontrolled glaucoma
* Significant macular puckering (Govetto staging ≥ stage 2)
* Patients who are unable to give informed consent
* Patients who are pregnant

Where it's running

  • Hong Kong Eye Hospital
    Hong Kong, Hong Kong
    Recruiting
  • Poznan University of Medical Sicences, University Hospital in Poznan
    Poznan, Poland
    Not yet recruiting
  • Chang Gung Memorial Hospital
    Taoyuan, Taiwan
    Not yet recruiting

Study contacts

  • Principal investigator: Simon KH Szeto, MBChB, FRCOphth — Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong
  • Study coordinator: Simon KH Dr Szeto, MBChB, MSc, FRCOphth
  • Email: simonkhszeto@cuhk.edu.hk
  • Phone: 852 39435886

Similar studies

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.