Status:
COMPLETED
Toric Orthokeratology - Slowing Eye Elongation
Lead Sponsor:
The Hong Kong Polytechnic University
Collaborating Sponsors:
Menicon Co., Ltd.
Conditions:
Myopia
Astigmatism
Eligibility:
All Genders
6-12 years
Phase:
NA
Brief Summary
The aims of this study are to investigate the effects of ortho-k for astigmatic and myopic reduction and myopic control in children, and the long term effects on corneal curvatures and biomechanics.
Detailed Description
Ortho-k has been shown to be effective in correcting low myopia but relatively ineffective for astigmatism, using spherical reverse geometry lens designs. Toric ortho-k lenses have been introduced in ...
Eligibility Criteria
Inclusion
- Myopia (refractive sphere): more than -0.50DS to -5.00DS
- Astigmatism: with-the-rule astigmatism more than -1.25DC
- Anisometropia: ≤ 1.50D in both refractive sphere
- Best corrected monocular visual acuity: equal to or better than 0.10 in logMAR scale in both eyes
- 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 myopia 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 :
May 1 2008
Trial Type :
INTERVENTIONAL
Allocation :
ACTUAL
End Date :
December 1 2012
Estimated Enrollment :
80 Patients enrolled
Trial Details
Trial ID
NCT00978692
Start Date
May 1 2008
End Date
December 1 2012
Last Update
February 22 2016
Active Locations (1)
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1
School of Optometry, The Hong KOng Polytechnic University
Hong Kong SAR, China