Corneal Biomechanics During Pregnancy (CorvisPreg)

June 18, 2020 updated by: University of Zurich

Change in Corneal Biomechanics During Pregnancy

It is known that intraocular pressure changes during pregnancy. Collagen structure changes during pregnancy to enable softening of the symphysis, whitening of the birth chanel, and, thus, ultimately to enable delivery of a child. The cornea consists of highly structured collagen fibers. Hence, it seams logically that corneal biomechanics also change during pregnancy.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Unknown

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

It is known that intraocular pressure changes during pregnancy. Collagen structure changes during pregnancy to enable softening of the symphysis, whitening of the birth chanel, and, thus, ultimately to enable delivery of a child. The cornea consists of highly structured collagen fibers. Hence, it seams logically that corneal biomechanics also change during pregnancy.

Measurement of intraocular pressure is highly dependant on corneal properties. With the Corvis ST device by Ocular Inc. it is possible to measure intraocular pressure and investigated corneal biomechanics. The aim of this study is therefore to compare corneal biomechanical properties during the third trimester with corneal biomechanical properties at 3 months after delivery.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Anticipated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
50

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.
  • Name: Marc o Toeteberg-Harms, MD, FEBO
  • Phone Number: +41442551111 +41442551111
  • Email: marc.toeteberg@usz.ch

Study Contact Backup

Study Locations

  • Switzerland
    • ZH
      • Zurich, ZH, Switzerland, 8091
        • Recruiting
        • Department of Ophthalmology
        • Contact:
          • Marc Toeteberg-Harms, MD, FEBO
          • Phone Number: +41442558794 +41 44 255 - 1111
          • Email: marc.toeteberg@usz.ch
        • Principal Investigator:
          • Marc Toeteberg-Harms, MD
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 38 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Sampling Method

Non-Probability Sample

Study Population

healthy pregnant women with uncomplicated singleton pregnancy

Description

Inclusion Criteria:

  • females
  • pregnant
  • age 18 to 38 yo
  • uncomplicated singleton pregnancy

Exclusion Criteria:

  • any history of ocular disease or surgery other than conjunctivitis, especially no history of glaucoma or corneal disease
  • systemic diseases, i.e. diabetes, hypertension, collagenase
  • current contact lens wear
  • before pregnancy taking any systemic or ocular medications

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Pregnant women
Pregnant woman, age 18 to 38 yo, with uncomplicated singleton pregnancy and no ocular diseases.
Device: Non-Contact measurement of corneal properties
Corneal Properties will be measurement with the non-contact Corvis ST Air-Puff Tonometer by Oculus Inc.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Change in Deformation Amplitude
Time Frame: at 3 month post delivery compared to during third trimester
Change in Deformation Amplitude (in millimeters) at 3 month post delivery compared to during third trimester will be assessed.
at 3 month post delivery compared to during third trimester
Change in Applanation Length
Time Frame: at 3 month post delivery compared to during third trimester of the pregnancy
Change in Applanation Length (in millimeters) at 3 month post delivery compared to during third trimester of the pregnancy will be assessed.
at 3 month post delivery compared to during third trimester of the pregnancy
Change in Corneal Velocity
Time Frame: at 3 month post delivery compared to during third trimester of the pregnancy
Change in Corneal Velocity (in meters/second) at 3 month post delivery compared to during third trimester of the pregnancy will be assessed.
at 3 month post delivery compared to during third trimester of the pregnancy
Change in corneal thickness
Time Frame: at 3 month post delivery compared to during third trimester of the pregnancy
Change in corneal thickness (in millimeters) at 3 month post delivery compared to during third trimester of the pregnancy will be assessed.
at 3 month post delivery compared to during third trimester of the pregnancy
Change in Intraocular pressure
Time Frame: at 3 month post delivery compared to during third trimester of the pregnancy
Change in intraocular pressure (in millimeters of mercury, mmHg) at 3 month post delivery compared to during third trimester of the pregnancy will be assessed.
at 3 month post delivery compared to during third trimester of the pregnancy

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of Zurich

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Marc Toeteberg-Harms, MD, FEBO, University Hospital Zurich, Dpt. of Ophthalmology

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2016

Primary Completion (Anticipated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 31, 2020

Study Completion (Anticipated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 31, 2021

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
June 11, 2020

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 11, 2020

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
June 16, 2020

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
June 22, 2020

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 18, 2020

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
June 1, 2020

More Information

Terms related to this study

Keywords

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • CorvisPreg

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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