Open Angle GlaucomaNCT01923714
Impact of a Tolerability Switch to Dorzolamide/Timolol Preservative-free Fixed Combination on Ocular Surface Symptoms
An observational study of Open Angle Glaucoma, run by Universitaire Ziekenhuizen KU Leuven at 1 site in Belgium.
Trial summary
This study aims at validating in real-life clinical practice and using the self-reported Glaucoma Symptom Scale (GSS) questionnaire, the impact of a switch to preservative-free dorzolamide/timolol fixed combination (DTFC) in patients using preserved topical therapy for glaucoma. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Open Angle Glaucoma
- How many people
- 103 participants
- Where
- 1 siteBelgium
- Study dates
- Aug 2011to Oct 2012
- Phase
- Observational
- Are there results?
- None posted in the registry
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
Study population: Patients with OAG that require topical therapy for intraocular pressure lowering and that were scheduled to switch current therapy to preservative-free DTFC
Who may be able to join
- Adults patients aged over 18 years old at inclusion visit
- Diagnosed as having OAG in one or both eyes
- Who have used the previous preserved eye drops treatment for at least 4 weeks in one eye or both eyes
- Experiencing pre-established ocular surface disease symptoms, as defined in the 2007 report of the International Dry Eye Workshop
- Being scheduled by their ophthalmologist for a switch to preservative-free DTFC eye drops (as monotherapy or replacement of one preserved product of a combined therapy) at inclusion visit due to tolerability issues
- Accepting to participate in the study and who has provided a written informed consent
Who cannot join
- Patients who had filtering or other ocular surgery within the 6 months preceding the inclusion visit
- Who have already been treated with preservative-free DTFC
- Whose visual acuity is importantly impaired by a severe ocular disease other than OAG, as assessed by the physician
- Currently involved in a clinical trial or study cohort or pharmaco-epidemiology study or interventional study
- With serious mental or physical disability which could interfere with a patient-reported assessment
- Pregnant women.
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Impact of a Tolerability Switch to Dorzolamide/Timolol Preservative-free Fixed Combination on Ocular Surface Symptoms in Belgian Glaucoma Patients
This study aims at validating in real-life clinical practice and using the self-reported Glaucoma Symptom Scale (GSS) questionnaire, the impact of a switch to preservative-free dorzolamide/timolol fixed combination (DTFC) in patients using preserved topical therapy for glaucoma.
Read the detailed description
The study is an 8-week multi-center, prospective, observational and non-interventional, open-label study aiming at assessing a change in visual-related quality of life of glaucoma patients that switch therapy to preservative-free DTFC. As a non-interventional study, the decision for the to switch was at the discretion of the physician. Patients scheduled to switch therapy to preservative free DTFC will be asked to fill in the 10 item, linkert-type GSS questionnaire at baseline, at week 4 and at week 8 of therapy switch.
The study data will be collected at a baseline and at 2 follow-up visits occurring 4 weeks +/- 1 week and 8 weeks +/- 1 week. If no visit was scheduled, the patient was asked to send the completed documents to the physician.
- Conditions
- Open Angle Glaucoma
- Keywords
- Glaucoma
- Medical subject headings
- Glaucoma, Open-Angle, Glaucoma
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| Glaucoma | Patients with open-angle glaucoma (OAG) that require topical intraocular pressure lowering therapy and that were scheduled to switch current therapy to preservative-free DTFC. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in Glaucoma Symptom Scale questionnaire
The main study objective was to assess a change in the patient-reported Glaucoma Symptom Scale questionnaire, filled in at baseline (Week 0) and at the end of the 8 week of therapy with preservative-free DTFC.
Measured: 8 weeks
Secondary outcomes (2)
Change in Functional-related items of the Glaucoma Symptom Scale
A secondary outcome was to assess a change in the patient-reported Glaucoma Symptom Scale questionnaire functional parameters, filled in at baseline (Week 0) and week 4 and week 8 of therapy with preservative-free DTFC.
Measured: 8 weeks
Change in Symptom-related items of the Glaucoma Symptom Scale
A secondary outcome was to assess a change in the patient-reported Glaucoma Symptom Scale questionnaire symptomatic parameters, filled in at baseline (Week 0) and week 4 and week 8 of therapy with preservative-free DTFC.
Measured: 8 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted15 Aug 2013 (estimated)
- Study startAug 2011
- Primary completionOct 2012
- Study completionOct 2012
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Open Angle GlaucomaStudies of the same condition, open and under way.
- More trials run by Universitaire Ziekenhuizen KU LeuvenThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Prospective
- Enrolment
- 103 participants (actual)
Sponsor and investigators
- Lead sponsor
- Universitaire Ziekenhuizen KU Leuven
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Ingeborg Stalmans, MD, PhD, Principal investigator, UZ Leuven
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01923714
- Sponsor's protocol ID
- S-53534
- Status last verified
- Dec 2012
- First submitted
- 13 Aug 2013
- Last updated
- 15 Aug 2013
- Results posted
- No
- Data monitoring committee
- No
Study at a glance
From the registry record, last updated by the sponsor on 15 Aug 2013. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Impact of a Tolerability Switch to Dorzolamide/Timolol Preservative-free Fixed Combination on Ocular Surface Symptoms in Belgian Glaucoma Patients
- ClinicalTrials.gov ID
- NCT01923714
- Acronym / sponsor ID
- S-53534
- Conditions
- Open Angle Glaucoma
- Keywords
- Glaucoma
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 103 participants (actual)
- Lead sponsor
- Universitaire Ziekenhuizen KU LeuvenUniversity, hospital or other
- Study start
- Aug 2011
- Primary completion
- Oct 2012 (actual)
- Study completion
- Oct 2012 (actual)
- First posted
- 15 Aug 2013 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study aims at validating in real-life clinical practice and using the self-reported Glaucoma Symptom Scale (GSS) questionnaire, the impact of a switch to preservative-free dorzolamide/timolol fixed combination (DTFC) in patients using preserved topical therapy for glaucoma.
Detailed description
The study is an 8-week multi-center, prospective, observational and non-interventional, open-label study aiming at assessing a change in visual-related quality of life of glaucoma patients that switch therapy to preservative-free DTFC. As a non-interventional study, the decision for the to switch was at the discretion of the physician. Patients scheduled to switch therapy to preservative free DTFC will be asked to fill in the 10 item, linkert-type GSS questionnaire at baseline, at week 4 and at week 8 of therapy switch.
The study data will be collected at a baseline and at 2 follow-up visits occurring 4 weeks +/- 1 week and 8 weeks +/- 1 week. If no visit was scheduled, the patient was asked to send the completed documents to the physician.
Study design
- Observational model
- Case only
- Time perspective
- Prospective
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Glaucoma | – | –Patients with open-angle glaucoma (OAG) that require topical intraocular pressure lowering therapy and that were scheduled to switch current therapy to preservative-free DTFC. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- Patients with OAG that require topical therapy for intraocular pressure lowering and that were scheduled to switch current therapy to preservative-free DTFC
Key inclusion criteria (6 listed)
- Adults patients aged over 18 years old at inclusion visit
- Diagnosed as having OAG in one or both eyes
- Who have used the previous preserved eye drops treatment for at least 4 weeks in one eye or both eyes
- Experiencing pre-established ocular surface disease symptoms, as defined in the 2007 report of the International Dry Eye Workshop
- Being scheduled by their ophthalmologist for a switch to preservative-free DTFC eye drops (as monotherapy or replacement of one preserved product of a combined therapy) at inclusion visit due to tolerability issues
Key exclusion criteria (6 listed)
- Patients who had filtering or other ocular surgery within the 6 months preceding the inclusion visit
- Who have already been treated with preservative-free DTFC
- Whose visual acuity is importantly impaired by a severe ocular disease other than OAG, as assessed by the physician
- Currently involved in a clinical trial or study cohort or pharmaco-epidemiology study or interventional study
- With serious mental or physical disability which could interfere with a patient-reported assessment
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Change in Glaucoma Symptom Scale questionnaire
Time frame: 8 weeks
The main study objective was to assess a change in the patient-reported Glaucoma Symptom Scale questionnaire, filled in at baseline (Week 0) and at the end of the 8 week of therapy with preservative-free DTFC.
2 secondary outcomes
Change in Functional-related items of the Glaucoma Symptom Scale
Time frame: 8 weeks
Change in Symptom-related items of the Glaucoma Symptom Scale
Time frame: 8 weeks
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 15 Aug 2013.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Ingeborg Stalmans, MD, PhD principal investigator
UZ Leuven
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Open Angle Glaucoma, run by Universitaire Ziekenhuizen KU Leuven at 1 site in Belgium.
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 6 inclusion and 6 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: finished, as of the sponsor's last update on 15 Aug 2013. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Belgium. 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?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change in Glaucoma Symptom Scale questionnaire (time frame: 8 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
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 15 Aug 2013; AzTrials last refreshed its copy on 8 Nov 2026.