AstigmatismNCT00818532
Corneal Astigmatism Measurement Study
An observational study of Astigmatism, run by Alcon Research at 1 site in United States.
Trial summary
To assess which commercially available measurement device is most accurate in measuring low (< 1.0 D) degrees of corneal astigmatism. Read more about this study
- Who is it for?
- Ages 50 years and olderHealthy volunteers can take part
- Conditions the study is for
- Astigmatism
- How many people
- 50 participants
- Where
- 1 siteUnited States
- Study dates
- Dec 2008to Apr 2009
- 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 50 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Study population: community sample
Who may be able to join
- 50 years of age and older
- Proof of eye exam within the last 3 months
- Corneal astigmatism of <1.0 diopter
Who cannot join
- Prior history of refractive or corneal surgery
- Corneal trauma/disease
- Intraocular surgery
Trial locations and contacts
1 site in 1 country.
United States1 site
Alcon Call Center for Trial Locations
Fort Worth, Texas, 76134
About this study
To assess which commercially available measurement device is most accurate in measuring low (< 1.0 D) degrees of corneal astigmatism.
- Conditions
- Astigmatism
- Keywords
- Corneal astigmatism, Low diopter, Corneal measurement, Corneal astigmatism < 1 Diopter
- Medical subject headings
- Astigmatism
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 |
|---|---|---|
| 1 | Measurement device |
What is being measured
The primary outcome is the main question the study is designed to answer.
Measurement of corneal power
Measured: Day 1
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted7 Jan 2009 (estimated)
- Study startDec 2008
- Primary completionApr 2009
- Study completionApr 2009
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for AstigmatismStudies of the same condition, open and under way.
- 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
- Time perspective
- Prospective
- Enrolment
- 50 participants (actual)
Sponsor and investigators
- Lead sponsor
- Alcon Research
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00818532
- Sponsor's protocol ID
- P-08-04
- Status last verified
- Jul 2009
- First submitted
- 6 Jan 2009
- Last updated
- 9 Apr 2012
- Results posted
- No
- Data monitoring committee
- No
Study at a glance
From the registry record, last updated by the sponsor on 9 Apr 2012. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Corneal Astigmatism Measurement Study
- ClinicalTrials.gov ID
- NCT00818532
- Acronym / sponsor ID
- P-08-04
- Conditions
- Astigmatism
- Keywords
- Corneal astigmatism, Low diopter, Corneal measurement, Corneal astigmatism < 1 Diopter
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 50 participants (actual)
- Lead sponsor
- Alcon ResearchIndustry (pharma, biotech, devices)
- Study start
- Dec 2008
- Primary completion
- Apr 2009 (actual)
- Study completion
- Apr 2009 (actual)
- First posted
- 7 Jan 2009 (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.
To assess which commercially available measurement device is most accurate in measuring low (< 1.0 D) degrees of corneal astigmatism.
Study design
- Time perspective
- Prospective
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| 1 | – | –Measurement device |
Who may qualify
- Ages
- 50 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
- Study population
- community sample
Key inclusion criteria (3 listed)
- 50 years of age and older
- Proof of eye exam within the last 3 months
- Corneal astigmatism of <1.0 diopter
Key exclusion criteria (3 listed)
- Prior history of refractive or corneal surgery
- Corneal trauma/disease
- Intraocular surgery
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
Measurement of corneal power
Time frame: Day 1
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 9 Apr 2012.
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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.
The record lists no contact. Use the official record to reach the sponsor.
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 Astigmatism, run by Alcon Research at 1 site in United States.
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 3 inclusion and 3 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 9 Apr 2012. 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 United States. 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?
Measurement of corneal power (time frame: Day 1). 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 9 Apr 2012.