Condition category
Eye Diseases
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
Acquired punctal stenosis is a condition whereby the hole that drains the tears, the punctum, gets blocked leading to watery eyes. This can have a significant impact on someone's quality of life, like difficulties in performing everyday activities and temporary impairment of vision. There are a number of treatment options available to open up the punctum and drain the tears. The conventional treatment for this condition is a three-snip punctoplasty, which involves having a small operation to surgically enlarge the punctum. This is the procedure that is routinely offered to patients at our hospital. More recently, a “plug” has been developed that stretches the punctum. It is placed in the punctum and stays there for two months and is then removed. The plug is safe and is licensed for this use. Most people are not aware of it when it is in place. The advantage of the plug is that it does not involve cutting open the punctum, i.e. it avoids having an operation, so it is a smaller procedure and is less invasive. It is also reversible and does not preclude having the operation at a later stage. The aim of this research study is to compare the two treatment options to assess whether the perforated punctal plugs and three-snip procedures are similarly effective. We will assess the outcome of each in terms of impact on quality of life as well amount of watering after procedures.

Who can participate?
Adults aged 18 and older who have acquired punctual stenosis of the lower eyelid.

What does the study involve?
Participants are randomly allocated to one of two groups. Those in the first group receive the plug treatment. The plugs are removed after two months. Those in the second group receive the 3-snip procedure. All participants attend a follow up appointment at six months and receive a telephone call after 12 months to assess the severity of participant’s watery eyes.

What are the possible benefits and risks of participating?
There are no direct benefits with participating. Those in the punctual plug group require a extra follow-up visit to the clinic to remove the plug. Participants receive a follow up telephone one year after the procedure to see if there is any illness or discomfort during the study.

Where is the study run from?
Western Eye Hospital (UK)

When is the study starting and how long is it expected to run for?
June 2014 to January 2020

Who is funding the study?
The British Oculoplastic Surgery Society (BOPSS) (UK)

Who is the main contact?
Dr Jeremy Hoffman

Trial website

Contact information



Primary contact

Dr Jeremy Hoffman


Contact details

Imperial College Ophthalmic Research Group
Western Eye Hospital
153-173 Marylebone Road
United Kingdom
+44 (0)203 312 9793

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

Perforated Punctal Plug as an alternative to the three snip punctoplasty for the treatment of acquired lacrimal punctum stenosis: the POPPY study


Study hypothesis

The aim of this study is to determine if perforated punctal plugs are an acceptable alternative to 3-snip punctoplasty in the treatment of acquired punctal stenosis.

Ethics approval

London - Central Research Ethics Committee, 20/07/2017, ref: 17/LO/1003

Study design

Randomised; Interventional; Design type: Treatment, Diagnosis, Device, Imaging, Surgery

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details to request a patient information sheet


Specialty: Ophthalmology, Primary sub-specialty: Other; UKCRC code/ Disease: Eye/ Other disorders of eye and adnexa


Randomisation is computer generated sequential binary randomisation in blocks of 10.

Punctal plugs treatment arm:
Perforated punctal plugs, coated with a thin layer of polyvinylpyrrolidone (PVP) silicone (FCI Ophthalmics), are available as 0.7mm and 0.9mm devices. Since the puncta they are used in are by definition stenosed, the 0.7mm size is suitable in most cases. These are inserted under topical anaesthesia (0.5% proxymetacaine) or local anaesthesia as described for 3-snip punctoplasty above. As in the 3-snip procedure, the first step is punctal dilatation; with the lower eyelid on lateral stretch, the punctum and proximal canaliculus is dilated with a Nettleship dilator. The PPP is inserted soon after dilatation. The inserter is held between the thumb and index finger, and the plug is orientated in the correct plane. The plug is introduced gently in a vertical and progressive manner. The plug is released from the inserter by depressing the inserter handle. Attention is given to the final position of the plug to achieve an optimal fit against the lid margin.

3-snip procedure:
The 3-snip procedure, is performed as follows. Local anaesthetic (such as xylocaine 1% with 1:200,000 adrenaline) is injected inferior to the punctum (transcutaneously and/or transconjunctivally). With the lower eyelid on lateral stretch, the punctum and proximal canaliculus is dilated with a Nettleship dilator. A blade or fine scissors are used to make a vertical cut through the posterior aspect of the proximal canaliculus. The proximal horizontal portion of the canaliculus (less than one third of the length) is then opened using the blade / scissors. Finally, a small posterior lamellar triangle of conjunctiva and canaliculus is removed.

Treatment is a once-only surgical procedure. The plugs are removed at two-months. Each arm is reviewed in person at six months and then by telephone follow-up at 12 months.

Intervention type



Drug names

Primary outcome measure

Estimated number of times eye has watered in the past week, as assessed by questions 2 and 3 in the Imperial Watery Eye Quality of Life Questionnaire at baseline, 6 months and 12 months

Secondary outcome measures

1. Effect of watering on quality of life, assessed on an 11-point numerical rating scale as part of the watery eye quality of life questionnaire (Appendix 6), at 12 months post procedure; in the case of PPPs this will be 12 months post plug removal.
2. Slit lamp examination of punctum. A punctum size of Grade 3-5, as defined on the visual grading system by Kashkouli et al, (Appendix 4) will be considered successful
3. Slit lamp examination of tear meniscus. A tear meniscus greater than 0.3mm will be considered raised, a secondary measure of anatomical failure.
4. OCT of lacrimal punctum. There are not sufficient normative databases in the literature to use as a reference but we will compare figures pre- and post-operatively to assess the effect of the treatments and to assess the utility of OCT as a tool for analysing puncta

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Age ≥ 18 years (men and women)
2. Epiphora as a result of acquired punctal stenosis of lower lids
3. Full patency on lacrimal syringing
4. Willing to undergo a procedural intervention
5. Willing and able to give written informed consent

Participant type


Age group




Target number of participants

Planned Sample Size: 60; UK Sample Size: 60

Participant exclusion criteria

1. History of congenital punctal stenosis
2. History of punctal stenosis associated with chemotherapy
3. Completely stenosed or occluded punctum
4. Abnormality on lacrimal syringing
5. Moderate or severe lower eyelid laxity or eyelid malposition
6. Use of eye drops, other than lubricants, within the past 3 months or planned in the study eye during the course of the trial
7. Eyelid or ocular surgery within the past 3 months or planned surgery in the study eye, during the course of the trial
8. Planned chemotherapy during the course of the trial
9. Planned nasal or sinus surgery during the course of the trial
10. Any other condition or situation that, in the opinion of the investigator, may prevent the participant complying with the study or follow-up procedures

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

Western Eye Hospital
153-173 Marylebone Road
United Kingdom

Sponsor information


Imperial College Healthcare NHS Trust

Sponsor details

St. Marys Hospital
Praed Street
W2 1NY
United Kingdom

Sponsor type

Hospital/treatment centre



Funder type

Research organisation

Funder name

The British Oculoplastic Surgery Society (BOPSS)

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

It is intended that the results of the study will be reported and disseminated at an international conference and published in a high-impact peer-reviewed scientific journal.

IPD sharing statement:
The data sharing plans for the current study are unknown and will be made available at a later date.

Intention to publish date


Participant level data

To be made available at a later date

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

10/09/2018: The following changes were made to the trial record: 1. The recruitment end date was changed from 31/07/2018 to 31/01/2019. 2. The overall trial end date was changed from 31/07/2019 to 31/01/2020. 3. The intention to publish date was changed from 31/08/2019 to 28/02/2020.