Age-Related Changes and Cycloplegia-Induced Differences in the Human Crystalline Lens

September 30, 2020 updated by: Yune Zhao, Wenzhou Medical University

Age-Related Changes and Cycloplegia-Induced Differences of the Human Crystalline Lens, Schlemm' s Canal and Trabecular Meshwork：an in Vivo Swept-Source Optical Coherence Tomography Study

The ocular biometric parameters of the human crystalline lens including anterior chamber depth (ACD), lens thickness (LT), radii of curvature of anterior and posterior lens (ALR and PLR), lens equatorial diameter (LED), and lens vault (LV), automatically quantified by the CASIA2 (SS-OCT; Tomey, Nagoya, Japan). Images of iridocorneal angle were obtained using CASIA2 and the Schlemm' s canal (SC) and trabecular meshwork (TM) were quantified manually. Both cycloplegia and non-cycloplegia images were obtained.

Study Overview

Status

Status

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

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.

Detailed Description

Healthy individuals aged between 6 and 90 years, without history of ocular disease (except age-related cataract and/or myopia), were consecutively included from April to May 2019. All participants underwent visual acuity, dry and wet refraction, anterior and posterior segment examination, intraocular pressure (IOP), and axial length (AL) using IOL-Master 700 (Carl Zeiss Meditec AG). Investigators recruited children under 18 years old at a refraction outpatient clinic, who were prescribed cyclopentolate hydrochloride eyedrops (S.A. Alcon-Couvreur N.V., Belguim) for cycloplegic refraction. For adults, they were prescribed compound tropicamide eyedrops (Mydrin-P, Santen Pharmaceutical Co., Ltd, Osaka, Japan), consisting of 0.5% tropicamide mixed with 0.5% phenylephrine hydrochloride, for pupillary dilation in order to perform fundus examination at an outpatient clinic. Exclusion criteria were as follow:ocular diseases other than cataracts; history of eye surgeries or injuries; shallow anterior chamber with a risk of angle closure. The data from right eye was selected for analysis.

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 (Actual)

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.
129

Contacts and Locations

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

Study Locations

  • China
    • Zhejiang
      • Wenzhou, Zhejiang, China, 325027
        • Ophthalmology and Optometry Hospital

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

6 years to 86 years (Child, Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

Healthy individuals aged between 6 and 90 years, without history of ocular disease (except age-related cataract and/or myopia) at Eye hospital of Wenzhou Medical University

Description

Inclusion Criteria:

Healthy individuals aged between 6 and 90 years, without history of ocular disease (except age-related cataract and/or myopia) Must be able to cooperate examination

Exclusion Criteria:

ocular diseases other than cataracts history of eye surgeries or injuries shallow anterior chamber with a risk of angle closure

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.
Group 1
participants of less than 18 years old
Group 2
participants aged from 18 years to 40 year
Group 3
participants aged from 41 years to 60 years
Group 4
participants over 60 years old

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
Paired Comparison Before and After Cycloplegia
Time Frame: 2020.2.3
The cycloplegia-induced differences of parameters was defined as: the post-cycloplegic value minus the pre-cycloplegic value.
2020.2.3
Evaluated the effect of age on the TM/SC morphologies
Time Frame: 2020.2.3
The age-related variations of TM/SC parameters from four age groups were compared.
2020.2.3

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Evaluated the effect of age on the ocular biometric data
Time Frame: 2020.2.3
The age-related variations of ocular biometric data such as axial length (AL), lens thickness (LT), and anterior chamber depth (ACD) from four age groups were compared.
2020.2.3

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.
Wenzhou Medical University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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.
April 1, 2019

Primary Completion (Actual)

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.
May 31, 2019

Study Completion (Actual)

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 30, 2020

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).
September 21, 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.
September 30, 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.
October 6, 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.
October 6, 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.
September 30, 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.
September 1, 2020

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

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.
  • SSOCT-ocular parameters change

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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