- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01166503
Early Versus Delayed Surgery for Infantile Esotropia
June 11, 2018 updated by: Agnes Wong, The Hospital for Sick Children
Early Versus Delayed Surgery for Infantile Esotropia: A Clinical Evaluation of Sensory and Motor Outcomes
The goal of this study is to determine whether corrective surgery done earlier than the current standard can better improve the visual and eye movement deficits in children with infantile esotropia (crossed eyes in infancy).
Study Overview
Status
Completed
Conditions
Detailed Description
While there is a uniform agreement among pediatric ophthalmologists that most infantile esotropia requires surgical correction, the proper timing of surgery is controversial.
In North America, the typical age at surgery ranges from 11-18 months.
Unfortunately, despite successful surgical realignment of the eyes, the sensory and eye movement deficits often persist.
Recently, some pediatric ophthalmologists have advocated earlier surgery.
The rationale for early surgery stems from animal and human research showing that early realignment of the eyes within an early critical period allows normal development of the sensory and eye movement systems.
Study Type
Observational
Enrollment (Actual)
71
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
-
-
Ontario
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Toronto, Ontario, Canada, M5G 1X8
- The Hospital for Sick Children
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-
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
Ages Eligible for Study
3 months to 1 year (Child)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Sampling Method
Non-Probability Sample
Study Population
Patients with infantile esotropia will be enrolled from The Hospital for Sick Children in Toronto.
Infants with characteristics that indicate low likelihood of spontaneous resolution will be studied.
Description
Inclusion Criteria:
- onset of esotropia after 10 weeks of age;
- constant esotropia ≥ 20° (40 prism diopter or PD) at near (1/3 m) on two examinations, separated by 2-4 weeks; and
- refractive error ≤ +3.00 diopters (far-sightedness).
Exclusion Criteria:
- gestational age < 34 weeks;
- birth weight ≤ 1500 g;
- ventilator treatment in the newborn period;
- history of meningitis or other major medical event;
- developmental delay;
- incomitant or paralytic strabismus;
- manifest nystagmus or head bobbing;
- prior eye muscle surgery;
- prior treatment of amblyopia or spectacle correction for refractive errors;
- presence of structural ocular anomalies.
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 |
Intervention / Treatment |
---|---|
Early Surgery
This group will be made up of subjects whose parents choose to have them undergo corrective surgery at or before age 11 months.
|
Five small sensors are placed on the head which record the brain's response to moving stripes that are displayed on a computer screen.
Each eye is tested while the other eye is patched.
Each recording trial lasts about 10 seconds, and several trials are done for each eye.
Subjects will have their 3D perception measured using standard clinical stereo tests (Randot, Lang, Titmus).
Subjects will be asked to view a screen with vertical stripes moving in both leftward and rightward directions while their eye movements are recorded using a remote video-based eye tracker.
Subjects will view a computer screen that has two panels of dots on them.
The subject will be required to pick which panel has a section of dots that are moving in a specific direction (ie.
nasalward/temporalward).
Subjects will view a computer screen that has two panels of randomly moving dots on them.
The subject will be required to pick which panel has a section of dots that are moving in a specific direction (ie.
nasalward/temporalward).
|
Standard Surgery
This group will be made up of subjects who present after age 11 months or whose parents choose to have them undergo corrective surgery between 11-18 months.
|
Five small sensors are placed on the head which record the brain's response to moving stripes that are displayed on a computer screen.
Each eye is tested while the other eye is patched.
Each recording trial lasts about 10 seconds, and several trials are done for each eye.
Subjects will have their 3D perception measured using standard clinical stereo tests (Randot, Lang, Titmus).
Subjects will be asked to view a screen with vertical stripes moving in both leftward and rightward directions while their eye movements are recorded using a remote video-based eye tracker.
Subjects will view a computer screen that has two panels of dots on them.
The subject will be required to pick which panel has a section of dots that are moving in a specific direction (ie.
nasalward/temporalward).
Subjects will view a computer screen that has two panels of randomly moving dots on them.
The subject will be required to pick which panel has a section of dots that are moving in a specific direction (ie.
nasalward/temporalward).
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Motion visual evoked potential (mVEPs) asymmetry
Time Frame: at age 2 years
|
mVEP measures the perception of nasalward and temporalward motion for each eye at the cortical level.
A nasal bias index (NBI) is calculated, which will show whether subjects perceive motion better for one direction over the other.
|
at age 2 years
|
Stereopsis
Time Frame: at 2 and 5 years of age
|
This measures the level of 3D depth perception.
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at 2 and 5 years of age
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Optokinetic nystagmus (OKN) asymmetry
Time Frame: at age 5 years
|
OKN is measured in both the nasalward and temporalward directions for each eye.
From this a nasal bias index (NBI) is calculated, which will show whether subjects perceive motion better in one direction or the other.
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at age 5 years
|
Global Motion Perception
Time Frame: at 2 and 5 years of age
|
Motion perception will be tested using two tasks: motion detection (at age 2 and 5 years) and motion discrimination (at age 5 years).
|
at 2 and 5 years of age
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Investigators
- Principal Investigator: Agnes Wong, MD, The Hospital for Sick Children, Toronto Canada
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
May 1, 2004
Primary Completion (Actual)
April 2, 2018
Study Completion (Actual)
April 26, 2018
Study Registration Dates
First Submitted
July 19, 2010
First Submitted That Met QC Criteria
July 19, 2010
First Posted (Estimate)
July 21, 2010
Study Record Updates
Last Update Posted (Actual)
June 12, 2018
Last Update Submitted That Met QC Criteria
June 11, 2018
Last Verified
June 1, 2018
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 1000005134
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
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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