- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00978679
Peripheral Optics in Myopia and Orthokeratology
February 22, 2016 updated by: Pauline Cho, The Hong Kong Polytechnic University
Peripheral Refraction and Aberration in Myopic Progression and Myopic Control
The primary objective of the current study is to investigate changes in peripheral refraction and aberration in children wearing orthokeratology lenses and single-vision spectacles.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Detailed Description
Apart from being effective in reducing low to moderate myopia, orthokeratology has been shown to have potential in retarding myopic progression.
The central cornea is flattened and peripheral optics altered in orthokeratology and it has been suggested that orthokeratology slows myopic progression through the alteration of peripheral optics.
The aim of the current study is to investigate the changes in peripheral refraction and aberration in children wearing orthokeratology (study group) and single-vision spectacles (control group).
Study Type
Interventional
Enrollment (Actual)
90
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
-
-
Hong Kong
-
Hong Kong, Hong Kong, China, 000000
- School of Optometry, The Hong Kong Polytechnic University
-
-
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
6 years to 9 years (Child)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Myopia (refractive sphere): > 0.50D and ≤ 6.00D
- Astigmatism: with-the-rule astigmatism (axes 180 +/- 30) ≤ 1.50D; astigmatism of other axes ≤ 0.50D
- Spherical equivalent (SE): > 0.50D and ≤ 6.75D (myopia)
- Best corrected monocular visual acuity: equal to or better than 6/7.5 in Snellen scale
- Willingness to wear contact lenses or spectacles on a daily basis
- Availability for follow-up for at least 2 years
Exclusion Criteria:
- Strabismus at distance or near
- Contraindication for contact lens wear and orthokeratology (e.g. limbus to limbus corneal cylinder and dislocated corneal apex)
- Prior experience with the use of rigid lenses (including orthokeratology)
- Prior experience with myopic control treatment (e.g. refractive therapy or progressive spectacles)
- Systemic or ocular conditions which may affect contact lens wear (e.g. allergy and medication)
- Systemic or ocular conditions which may affect refractive development (e.g. Down syndrome, ptosis)
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: Non-Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Orthokeratology
Myopic children wearing orthokeratology at night will be the study group
|
Nightly use of orthokeratology lenses to correct the refractive errors
Other Names:
|
Other: Others
Myopic children wearing single-vision spectacles in the daytime will serve as control group
|
Daily use of single vision lenses to correct refractive errors
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Changes in cycloplegic off-axial auto-refraction, aberration and eyeball length
Time Frame: 2 years
|
2 years
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Collaborators
Investigators
- Principal Investigator: Pauline Cho, PhD, School of Optometry, The Hong Kong Polytechnic 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
- Mathur A, Atchison DA. Effect of orthokeratology on peripheral aberrations of the eye. Optom Vis Sci. 2009 May;86(5):E476-84. doi: 10.1097/OPX.0b013e31819fa5aa.
- Cho P, Cheung SW, Edwards M. The longitudinal orthokeratology research in children (LORIC) in Hong Kong: a pilot study on refractive changes and myopic control. Curr Eye Res. 2005 Jan;30(1):71-80. doi: 10.1080/02713680590907256.
- Walline JJ, Jones LA, Sinnott LT. Corneal reshaping and myopia progression. Br J Ophthalmol. 2009 Sep;93(9):1181-5. doi: 10.1136/bjo.2008.151365. Epub 2009 May 4.
- Charman WN, Mountford J, Atchison DA, Markwell EL. Peripheral refraction in orthokeratology patients. Optom Vis Sci. 2006 Sep;83(9):641-8. doi: 10.1097/01.opx.0000232840.66716.af.
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
March 1, 2008
Primary Completion (Actual)
December 1, 2015
Study Completion (Actual)
December 1, 2015
Study Registration Dates
First Submitted
September 16, 2009
First Submitted That Met QC Criteria
September 16, 2009
First Posted (Estimate)
September 17, 2009
Study Record Updates
Last Update Posted (Estimate)
February 23, 2016
Last Update Submitted That Met QC Criteria
February 22, 2016
Last Verified
February 1, 2016
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- G-RGVM
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
product manufactured in and exported from the U.S.
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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