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Macular HoleNEMARNCT06908824

No Endotamponade for Macular Hole Repair: the NEMAR Study

A study testing Conventional surgery and ILM flap with no gas tamponade in people with Macular Hole and Macular Hole Surgery, run by Chinese University of Hong Kong at 3 sites in 3 countries.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

Full-thickness macular hole (MH) is a common sight threatening macular condition with a prevalence of 3.3 per 1000 individuals. Prompt surgical repair of MH is imperative in preventing irreversible vision loss from MH as the majority of patients would experience progressive loss of central vision, often resulting in… Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Macular Hole, Macular Hole Surgery
What is being tested?
Conventional surgery and ILM flap with no gas tamponade
Could I receive a placebo?
No, everyone receives an active treatment
How many people
180 participants
Where
3 sitesin 3 countries
Study dates
16 Sep 2025to 31 Dec 2027
Phase
Interventional
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • 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

Who cannot join

  • 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
Show all 9Show fewer
  • Significant macular puckering (Govetto staging ≥ stage 2)
  • Patients who are unable to give informed consent
  • Patients who are pregnant

Trial locations and contacts

3 sites in 3 countries. Contact the study team or a site near you to ask about taking part.

Simon KH Dr Szeto, MBChB, MSc, FRCOphth contact

852 39435886

simonkhszeto@cuhk.edu.hk

3 sites in 3 countries

Hong Kong1 site, 1 recruiting
  • Hong Kong Eye Hospital

    Hong Kong

    Simon KH Dr Szeto, MBChB, FRCOphth, 852 39435886, simonkhszeto@cuhk.edu.hk

    Amy HY Yu, MBChB, yu.amyy@gmail.com

    Recruiting

Other trials in Hong Kong

Poland1 site, 1 recruiting
  • Poznan University of Medical Sicences, University Hospital in Poznan

    Poznan

    Marcin Stopa, MD, PhD, FEBO, +48 61 854 72 20, stopa@ump.edu.pl

    Marcin Stopa, MD, PhD, FEBO

    Not yet recruiting

Other trials in Poland

Taiwan1 site, 1 recruiting
  • Chang Gung Memorial Hospital

    Taoyuan

    Hung Da Chou, MD, +886-975366127, hungda.chou28@gmail.com

    Chi Chun Lai, MD, chichun.lai@gmail.com

    Not yet recruiting

Other trials in Taiwan

About this study

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

Full-thickness macular hole (MH) is a common sight threatening macular condition with a prevalence of 3.3 per 1000 individuals. Prompt surgical repair of MH is imperative in preventing irreversible vision loss from MH as the majority of patients would experience progressive loss of central vision, often resulting in visual acuity (VA) of 20/200 or worse and the spontaneous closure rate is less than 10%.

Pars plana vitrectomy (PPV) with internal limiting membrane (ILM) peeling (with or without ILM flap) and gas tamponade, herein referred to as conventional surgery, is the current standard-of-care surgical technique in repairing MH.

Read more

Recently, a novel surgical technique that omits the need of gas tamponade to repair MH has been proposed, early results from retrospective studies were encouraging.

The purpose of this prospective international multi-centre randomised controlled study is to compare the efficacy and safety of two surgical techniques in treating MH:

  1. Conventional surgery: PPV with ILM peeling and gas or silicone oil tamponade
  2. ILM flap with no gas tamponade surgery: PPV with ILM flap with no gas tamponade
Read the detailed description

MH is a common macular condition that requires prompt surgical intervention to prevent irreversible vision loss. Conventional surgical repair of MH involves PPV, ILM peeling and gas tamponade followed by post-operative face down posturing. The use of gas tamponade, however, is associated with impairment of vision in the early post-operative period and restriction of air travel. Moreover, fluorinated ophthalmic gases are potent green house gases that contribute to global warming.

Recently, a novel surgical technique to repair MH without endotamponade has been proposed, termed the ILM flap with no gas tamponade technique.

There is currently no published randomised controlled trial comparing the efficacy and safety of MH repair using conventional surgical technique and the ILM flap with no gas tamponade technique.

Patients with confirmed full thickness MH on optical coherence tomography will be screened and invited to join the study. Written informed consent will be obtained. Baseline screening will be performed.

Recruited study participants will be randomly allocated to one of the two study groups:

  1. Conventional surgery: Participants will undergo PPV, ILM peeling and gas tamponade to repair the MH. They would be instructed to adopt a face down posture for at least 5 days post-operatively.
  2. ILM flap with no gas tamponade surgery: Participants will undergo PPV, ILM flap. No gas tampons would be required and there would be no restriction on post-operative posturing.

Participants will be instructed to attend post-operative follow up visits to undergo routine clinical examination, visual acuity checking and retinal imaging performed.

Being tested
Conventional surgery, ILM flap with no gas tamponade
Keywords
Macular Hole, Vitrectomy, Macular surgery, Internal limiting membrane peeling, Gas tamponade
Medical subject headings
Retinal Perforations

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Conventional surgeryProcedure or surgery

    Pars plana vitrectomy (PPV) with temporal internal limiting membrane (ILM) flap would be performed. Perfluorocarbon liquid (PFCL) or viscoelastic may be used as an adjunct. Air/Fluid exchange would be performed at the end of surgery, further exchange of air with 8-14% octafluoropropane (C3F8) would be performed based on operating surgeon's discretion. In cases a temporal ILM flap could not be created, an ILM flap would be created from other quadrants, for example, a nasal ILM would be created instead. Patients with visually significant cataract may undergo concomitant phacoemulsification and intraocular lens implantation or deferred to post-operative month 6-12. Patients would be instructed to adopt a face-down posturing in the first 5 days following operation.

  • ILM flap with no gas tamponadeProcedure or surgery

    Pars plana vitrectomy with temporal internal limiting membrane (ILM) flap would be performed. The ILM flap would be stabilised over the macular hole using perfluorocarbon liquid (PFCL) followed by sub-PFCL dispersive viscoelastic injection. The PFCL would be removed towards the end of surgery. In cases a temporal ILM flap could not be created, an ILM flap would be created from other quadrants, for example, a nasal ILM would be created instead. Concomitant phacoemulsification and intraocular lens implantation would be performed in patients with visually significant cataract or deferred to post-operative month 6-12. Patients will be instructed to avoid excessive movement and adopt a face forward/ supine position for first 24 hours. Afterwards, there would be no restriction on post-operative posturing.

Study groups in NCT06908824
Study groupRoleWhat they receive
Conventional surgeryActive comparatorPatients would undergo conventional surgery to repair macular hole and be instructed to adopt a face-down posturing in the first 5 days following operation.
Receives: Procedure: Conventional surgery
Internal limiting membrane (ILM) flap with no gas tamponadeExperimentalPatients would undergo macular hole repair by the ILM flap with no gas tamponade technique. Patients will be instructed to avoid excessive movement and adopt a sit up/supine posture for the first 24 hours, beyond which there will be no posturing restriction.
Receives: Procedure: ILM flap with no gas tamponade

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Macular hole closure rate

    The primary outcome is the macular hole closure rate without additional vitrectomy/macular surgery at post-operative month 3.

    Closure of macular hole is defined as the presence of continuous retinal tissue over the retinal pigment epithelium (RPE) without bare RPE exposed to vitreous cavity on optical coherence tomography (OCT).

    Measured: 3 months

Secondary outcomes (6)
  1. Best Corrected Visual Acuity (BCVA) in the study eye

    Best corrected visual acuity will be checked using the Snellen visual acuity chart

    Measured: 12 months

  2. Pattern of macular hole closure

    The pattern of macular hole closure will be assessed on optical coherence tomography

    Measured: 12 months

  3. Rate of foveal gliosis

    Based on optical coherence tomography.

    Measured: 12 months

  4. Patients reported visual function

    The patient reported visual function will be assessed using the National Eye Institute 25-item visual function questionnaire (NEI VFQ-25).

    The score ranges from 0-100, with higher score indicating better visual function.

    Measured: 12 months

  5. Vision Preference Value Scale

    Using a previously validated questionnaire to determine vision preference value and treatment preferences.

    Preference values were graded on a scale from 0 to 1, with 0 indicating death and 1 indicating perfect health with perfect vision.

    Measured: 12 months

  6. Metamorphosia score

    Using M-CHARTS (Inami \& Co., Ltd., Tokyo, Japan) Ranges from 0-10. 0 indicates no metamorphopsia and 10 indicates severe metamorphopsia.

    Measured: 12 months

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted3 Apr 2025
  2. Study start16 Sep 2025
  3. Primary completion31 Dec 2027 (estimated)
  4. Study completion31 Dec 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
180 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06908824
Sponsor's protocol ID
CIRB-2025-084-2
Acronym
NEMAR
Status last verified
Aug 2025
First submitted
24 Mar 2025
Last updated
30 Sep 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Wada I, Yoshida S, Kobayashi Y, Zhou Y, Ishikawa K, Nakao S, Hisatomi T, Ikeda Y, Ishibashi T, Sonoda KH. Quantifying metamorphopsia with M-CHARTS in patients with idiopathic macular hole. Clin Ophthalmol. 2017 Sep 20;11:1719-1726. doi: 10.2147/OPTH.S144981. eCollection 2017.

    PubMed 29033537
  • Linz MO, Bressler NM, Chaikitmongkol V, Sivaprasad S, Patikulsila D, Choovuthayakorn J, Watanachai N, Kunavisarut P, Menon D, Tadarati M, Delalibera Pacheco K, Sanyal A, Scott AW. Vision Preference Value Scale and Patient Preferences in Choosing Therapy for Symptomatic Vitreomacular Interface Abnormality. JAMA Ophthalmol. 2018 Jun 1;136(6):658-664. doi: 10.1001/jamaophthalmol.2018.1272.

    PubMed 29800983
  • Chan CW, Wong D, Lam CL, McGhee S, Lai WW. Development of a Chinese version of the National Eye Institute Visual Function Questionnaire (CHI-VFQ-25) as a tool to study patients with eye diseases in Hong Kong. Br J Ophthalmol. 2009 Nov;93(11):1431-6. doi: 10.1136/bjo.2009.158428. Epub 2009 Jun 9.

    PubMed 19515645
  • Stopa M, Ciesielski M, Rakowicz P. Macular Hole Closure Without Endotamponade Application. Retina. 2023 Apr 1;43(4):688-691. doi: 10.1097/IAE.0000000000002850. Epub 2020 May 25.

    PubMed 32453068
  • Szeto SKH, Yu AHY, Tsang CW, Mohamed S, Chen LJ, Lai TYY. COMPLEX MACULAR HOLE CLOSURE BY TEMPORAL INTERNAL LIMITING MEMBRANE FLAP WITHOUT ENDOTAMPONADE. Retina. 2024 Nov 1;44(11):1915-1922. doi: 10.1097/IAE.0000000000004201.

    PubMed 39436300

Questions about this trial

What is this clinical trial studying?

A study testing Conventional surgery and ILM flap with no gas tamponade in people with Macular Hole and Macular Hole Surgery, run by Chinese University of Hong Kong at 3 sites in 3 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 9 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 30 Sep 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 3 sites in Hong Kong, Poland, Taiwan. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Simon KH Dr Szeto, MBChB, MSc, FRCOphth (852 39435886, simonkhszeto@cuhk.edu.hk), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Macular hole closure rate (time frame: 3 months). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT06908824, which also lists 5 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 30 Sep 2025.

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