ClinicalTrials.gg
RecruitingNCT03423758Updated May 23, 2025

Investigating the Genetic Basis of Pseudoexfoliation Syndrome, Angle-closure Glaucoma and Primary Open-angle Glaucoma

An observational study in Glaucoma, sponsored by Medical University of Vienna. Recruiting at 1 site in Austria. Open to participants aged 21 Years to 105 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-05-23.

Primary conditionGlaucoma, Open-AngleRegistry: GlaucomaReclassifiedWhy we changed it
Registry
Glaucoma — the first condition term the registry derived for this study.
ClinicalTrials.gg
Glaucoma, Open-Angle
Why
  1. The study's title name Glaucoma, Open-Angle, a narrower term within Glaucoma.
Confidence
High: the new condition is named in the study's own title. Of 46 hand-checked studies reclassified this way, 72% were exactly right and 89% in the right disease family; the registry's first term was right for 4% (measured 2026-10-21). How we classify →
Wrong?
Tell us the study's main condition →

Sponsored by Medical University of Vienna · Observational

From the registry’s dates

  • Primary completion was expected by Jan 2026, 9 months ago, but the record still lists the study as recruiting.
  • Started May 2017; still recruiting 9 years 5 months later.
Study type
Observational
Model
Cohort
Time perspective
Prospective
Enrollment
300
Ages
21 Years to 105 Years
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-12

Among 10 studies in Glaucoma, Open-Angle by Medical University of Vienna — 3 open to participants now, 3 under way, none of them phase 3. Glaucoma, Open-Angle · Medical University of Vienna.

Started
2017
with 1 other
Observational
3 of 10
1 open now
Registered
8th of 10
by date

Among the 10 studies in Glaucoma, Open-Angle by Medical University of Vienna, this one is one of 2 that started in 2017, is one of 3 observational ones, and was the 8th registered.

Glaucoma, Open-Angle

924 studies on the registry are indexed under Glaucoma, Open-Angle; 116 are open to participants now.

Browse Glaucoma, Open-Angle studies →

Open to participants now

3 of the 10 studies in Glaucoma, Open-Angle by Medical University of Vienna are open now, in 1 country. Recruiting first, the newest first:

By country, each count listing its studies:

All 3 open studies →

Where they have run

Who these studies take

Of the 83 Glaucoma, Open-Angle studies recruiting now, 64 (77%) set no upper age limit and 5 (6%) stop at 75 or younger; 5 take children under 18; 11 take healthy volunteers.

This study: 21 Years to 105 Years · all sexes · healthy volunteers too.

The full table on the hub →

This tab as a report to print or save as PDF → With an account.

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Watch this landscapeDownload CSVNarrow it in search →With an account: a weekly mail of what changed among 10 studies in Glaucoma, Open-Angle by Medical University of Vienna, or all of them as a file.
02

Study summary

There is increasing evidence that there are genetic risk factors for several forms of glaucoma, such as glaucoma caused by pseudoexfoliation syndrome (PXF) ,primary angle closure glaucoma (PACG) and primary open-angle glaucoma (POAG). The aim of the present prospective, multi-center, case-control study is to identify susceptibility genes/loci for PXF, PACG and POAG using a whole genome association (WGA) approach.

Read the detailed description

As worldwide populations become older because of shifts in demography, PXF may become a matter of greater concern. The search for genes responsible for PXF may lead to the identification of key molecules in pathways critical to the normal functioning of the eye. A better understanding of normal eye function may in turn lead to more accurate diagnosis and prognosis of ocular development, and inevitably to the emergence of novel classifications based on knowledge of the molecular pathology. Such knowledge may lead to more rational disease classification, better diagnostic tests, and improved prognostic accuracy. This is of particular relevance to PXF since there is a shortage of early reliable diagnostic tests and much evidence that the early commencement of treatment can arrest progressive asymptomatic loss of vision due to PXF-related glaucoma.

The search for genes responsible for PACG may lead to the identification of key molecules in pathways critical to the normal development of the eye. A better understanding of eye development may in turn lead to more accurate diagnosis and prognosis of ocular development, and inevitably to the emergence of novel classifications based on knowledge of the molecular pathology. Such knowledge may lead to more rational disease classification, better diagnostic tests, and improved prognostic accuracy. This is of particular relevance to glaucoma since there is a shortage of early reliable diagnostic tests and much evidence that the early commencement of treatment can arrest progressive asymptomatic loss of vision for which the disease is renowned.

Identification of responsible genes for POAG development can on one hand broaden our knowledge on disease pathophysiology and on the other hand open new doors in the search for pharmacological disease modification. Especially the latter is urgently needed as IOP has for many years been the only pharmacological target and fails to prevent disease progression in a certain proportion of POAG patients.

03

Conditions studied

  • Glaucoma

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Keywords

  • Pseudoexfoliation Glaucoma, Angle block glaucoma, Primary Open-Angle Glaucoma, Genetic
04

In context

Glaucoma, Open-Angle Reclassified

924 studies on the registry are indexed under Glaucoma, Open-Angle; 116 are open to participants now.

This study's planned enrollment of 300 is above the median of 101 across 184 observational studies indexed under Glaucoma, Open-Angle.

Browse Glaucoma, Open-Angle studies →

Lead sponsor

Medical University of Vienna is the lead sponsor of 1,109 studies on the registry; 184 are open to participants now.

Compared within Glaucoma, Open-Angle, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Glaucoma. The counts are of registry records indexed under each term, refreshed daily. How we classify →

05

Who can participate

Ages eligible
21 Years to 105 Years
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Probability sample

Study population

  1. Normal Healthy group
  2. Patients with Pseudoexfoliation Glaucoma
  3. Patients with Angle closure Glaucoma
  4. Patients with Primary open-angle Glaucoma

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. For patients with PXF:

    • Patients with confirmed pseudoexfoliation syndrome (exfoliation glaucoma / pseudoexfoliation of the lens) in the medical history
    • Age 50 years or more
  2. For patients with PACG:

    • Patients with confirmed acute primary angle closure (PAC) or primary angle closure glaucoma (PACG) in the medical history
    • Informed consent
    • Age 21 years or more
  3. For healthy controls:

    • No evidence of PXF, glaucoma or uveitis during clinical examination or in the medical history
    • No evidence of major ocular disease such as diabetic retinopathy, age related macular degeneration or conditions with genetic background during clinical examination or in the medical history
    • Age more than 60 years
    • Informed consent
  4. For patients with POAG:

    • Patients with confirmed primary open angle glaucoma (POAG)
    • No evidence of exfoliation glaucoma / pseudoexfoliation of the lens or pigment glaucoma
    • Informed consent
    • Age 30 or more

Exclusion criteria

Exclusion Criteria:

  • Patients and subjects will be excluded if one or more of the following criteria apply:
  • Neovascular glaucoma
  • Active or history of uveitis
  • Secondary angle closure such as neovascular glaucoma or uveitis/inflammatory eye disease
  • Inability to give
Terms in these criteria, in plain language(1)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

06

Study design

Observational model
Cohort
Time perspective
Prospective
Enrollment
300 participants (estimated)
Patient registry
No

Groups and cohorts

  • Healthy controls

    Healthy subjects with age more than 60 years

    Other: Blood sample

  • Pseudoexfoliation Glaucoma

    Already diagnosed Pseudoexfoliation glaucoma patients with age more than 50 years

    Other: Blood sample

  • Angle closure Glaucoma

    Already diagnosed Angle closure Glaucoma patients with age more than 21 years

    Other: Blood sample

  • Primary open-angle Glaucoma

    Already diagnosed primary open-angle glaucoma with age more than 30 years

    Other: Blood sample

Interventions

  • OtherBlood sample

    Blood sample

07

What researchers measure

Primary outcomes

  1. Genetic markers

    To identify the genetic markers in a whole genome association screen which show very strong association with PXF, ACG and POAG. The genomic regions identified from the above analyses will be analyzed using high density single nucleotide polymorphism (SNP) chips and/or sequencing of positional candidate genes to identify causal variants.

    Time frame: 1 day

08

Study locations

1 of 1 sites recruiting
09

References and documents

Individual participant data

Plan to share: Undecided

No publications or documents are linked to this record.

10

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Started May 2017 (actual). Primary completion is estimated for Jan 2026, 104 months after the start.

Of 53 observational studies under Glaucoma, Open-Angle, half reached primary completion within 25 months of starting (the median), counting those still running; a quarter within 12. This study's planned 104 months is above that.

How these figures are worked out, and which studies are left out of them.

Registered
Jan 8, 2018
First posted
Feb 6, 2018
StartActual
May 30, 2017
Primary completionEst.
Jan 30, 2026
CompletionEst.
Jan 30, 2026
Last update
May 23, 2025
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on May 23, 2025, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT03423758
Responsible party
Gerhard Garhofer (Assoc. Prof. PD Dr., Medical University of Vienna) — Principal investigator
First posted
Feb 6, 2018
Start date
May 30, 2017
Primary completion
Jan 30, 2026 (estimated)
Completion
Jan 30, 2026 (estimated)
Last update
May 23, 2025

Study contacts

Gerhard Garhöfer
Contact
gerhard.garhoefer@meduniwien.ac.at
0140 400 29880
Doreen Schmidl
Contact
doreen.schmidl@meduniwien.ac.at
0140 400 29880
Gerhard Garhöfer
principal investigator · Medical University of Vienna

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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