- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00950924
Optical Defocus to Stimulate Eye Elongation in Hyperopia (ODSEEH)
January 11, 2021 updated by: Aller, Thomas A., OD
Use of Multifocal Contact Lenses to Stimulate Axial Elongation in Axial Hyperopia
Axial hyperopia results when the length of the eye is too short for the eye to properly focus distance objects on the retina while the focusing system is relaxed.
Emmetropization is the process by which the eye actively adjusts various components of the eye to gradually improve the focus of the eye.
Emmetropization frequently involves either an increase or a decrease in the growth of the eye, particularly during infancy and childhood.
Numerous animal studies suggest that if an animal is exposed to retinal images located behind the retina either centrally or peripherally, the eye will grow in the direction of the focused image.
If an abnormally short eye has resulted in hyperopia, exposing such an eye to retinal images partially located behind the retina might encourage axial elongation, thus reducing the hyperopia.
Study Overview
Status
Unknown
Conditions
Intervention / Treatment
Detailed Description
Hyperopia or farsightedness may cause distance vision and near vision to be blurred.
Depending on the severity of the condition and the age of the patient and the status of the binocular vision system, hyperopia can also cause fatigue, asthenopia, headaches, double vision, and amblyopia.
Low to moderate amounts of hyperopia rarely cause much difficulty in the young person, but will eventually cause significant near vision problems as the patient ages.
Hyperopia can be caused by the eye being too short (axial hyperopia) or by the cornea being too flat or the crystalline lens being to weak (refractive hyperopia).
It has been established by the PI that axial growth can be dramatically lessened in children and adolescents with myopia through the use of bifocal contact lenses prescribed in a particular way (The CONTROL Study).
Studies by Earl Smith, O.D., Ph.D. have suggested that multi-zonal contact lenses that provide proper axial focus while manipulating peripheral defocus can either discourage or encourage axial growth to treat myopia or hyperopia respectively.
In the present study, simultaneous vision bifocal soft contact lenses will be used to encourage axial growth in hyperopic children and adolescents with axial hyperopia in an effort to reduce hyperopia.
Subjects will be randomly assigned to wear either bifocal soft contact lenses or single vision soft lenses.
The bifocal contact lenses will be prescribed to provide for clear central vision at both distance and near with the near zone of the contact, thus exposing the retina to hyperopic defocus from the distance zone.
Study Type
Interventional
Enrollment (Anticipated)
30
Phase
- Not Applicable
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
-
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California
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San Bruno, California, United States, 94066
- 711 Kains Ave
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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
5 years to 12 years (Child)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Aged 5-12
- Hyperopia > +1.25 each eye (cycloplegic refraction)
- Ability to wear soft contact lenses
Exclusion Criteria:
- Amblyopia
- Strabismus
- Astigmatism > 1.00 diopters
- Axial Length > 24.00 mm
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
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Triple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Bifocal Contact Lenses
Simultaneous Vision Bifocal Soft Contact Lenses will be prescribed such that the distance vision as measured by manifest subjective refraction will be properly corrected by the near vision add power and undercorrected by the distance power.
|
Simultaneous Vision Bifocal Soft Contact Lenses will be prescribed such that the distance vision as measured by manifest subjective refraction will be properly corrected by the near vision add power and undercorrected by the distance power.
|
Placebo Comparator: Single Vision Soft Contact Lenses
Subjects will be fitted with single vision soft contact lenses with goal of corrected emmetropia at a distance of 20 feet.
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Single vision soft contact lenses will be prescribed to properly correct the distance vision as measured by manifest subjective refraction.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Axial length
Time Frame: One year
|
One year
|
Secondary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Refractive Error
Time Frame: One year
|
One year
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Investigators
- Principal Investigator: Thomas A Aller, O.D., Unafilliated
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
January 1, 2015
Primary Completion (Anticipated)
October 1, 2021
Study Completion (Anticipated)
January 1, 2022
Study Registration Dates
First Submitted
July 30, 2009
First Submitted That Met QC Criteria
July 31, 2009
First Posted (Estimate)
August 3, 2009
Study Record Updates
Last Update Posted (Actual)
January 12, 2021
Last Update Submitted That Met QC Criteria
January 11, 2021
Last Verified
January 1, 2021
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- NCT00950924
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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