Status:
COMPLETED
Peripheral Optics in Myopia and Orthokeratology
Lead Sponsor:
The Hong Kong Polytechnic University
Collaborating Sponsors:
Menicon Co., Ltd.
Conditions:
Myopia
Eligibility:
All Genders
6-9 years
Phase:
NA
Brief Summary
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.
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 a...
Eligibility Criteria
Inclusion
- 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
- 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)
Key Trial Info
Start Date :
March 1 2008
Trial Type :
INTERVENTIONAL
Allocation :
ACTUAL
End Date :
December 1 2015
Estimated Enrollment :
90 Patients enrolled
Trial Details
Trial ID
NCT00978679
Start Date
March 1 2008
End Date
December 1 2015
Last Update
February 23 2016
Active Locations (1)
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1
School of Optometry, The Hong Kong Polytechnic University
Hong Kong, Hong Kong, China, 000000