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Myopia Control With Simultaneous Vision Approach

This study has been completed.
Information provided by (Responsible Party):
Carly Lam, The Hong Kong Polytechnic University Identifier:
First received: June 11, 2009
Last updated: July 2, 2014
Last verified: July 2014
To determine if the 'Defocus Incorporated Soft Contact' (DISC) lens slows myopia progression in Hong Kong schoolchildren using simultaneous vision approach.

Condition Intervention Phase
Device: Defocus Incorporated Soft Contact (DISC) lens
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Investigator)
Primary Purpose: Treatment
Official Title: Control of Myopia Progression in Myopic Children Using Simultaneous Vision Approach

Resource links provided by NLM:

Further study details as provided by The Hong Kong Polytechnic University:

Primary Outcome Measures:
  • The changes of cycloplegic refractive errors [ Time Frame: every 6 months for 2 years ]
    Refractive error was measured using Shin-Nippon NVision-K 5001 autorefractor The changes of cycloplegic objective refractive errors between the treatment and the control were compared.

Secondary Outcome Measures:
  • The changes of axial length [ Time Frame: every 6 months for 2 years ]
    Axial length was measured after cycloplegia using IOL Master

Enrollment: 100
Study Start Date: July 2007
Study Completion Date: June 2011
Primary Completion Date: January 2011 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
No Intervention: single vision soft contact lens
Single vision soft contact lenses with same materials of the DISC lens
Experimental: Defocus Incorporated Soft Contact (DISC) lens
The use of DISC lens to slow down the progression of myopia
Device: Defocus Incorporated Soft Contact (DISC) lens
Use of simultaneous vision bifocal soft contact lenses with myopic defocus to control the progression of myopia
Other Names:
  • myopia control
  • myopia progression
  • Simultaneous vision
  • bifocal contact lens

Detailed Description:
The investigators hypothesize that the natural process of emmetropization in human is regulated by the equilibrium between the opposite hyperopic and myopic defocus. A sharp focus of retinal image (foveal fixation) is fundamental for co-ordination of the equilibrium. The DISC lens is a custom-made multi-zone bifocal soft contact lens which is based on simultaneously provides clear vision and defocus at all viewing distances. It comprises of correcting zones for correcting distant prescription(correction of refractive error, and defocusing zones to incorporate constant myopic defocus for slowing down myopia progression.

Ages Eligible for Study:   8 Years to 13 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Age 8-13 years
  • Myopia (SE) between -1D to -5D
  • Astigmatism less than or equal to -1D
  • Anisometropia: less than or equal to 1.25D
  • aided VA (monocular): 0.00 log MAR or better
  • willingness to wear contact lens constantly
  • availability for follow-up for at least 2.5 years
  • parents' understanding and acceptance
  • willing to provide refractive status of grandparents

Exclusion Criteria:

  • Severe ocular or systemic allergies
  • Taking any medication that might have an impact on contact lens wear or that might influence the outcome of the clinical trial
  • Ocular or systemic condition that might affect refractive development
  • Strabismus at distance or near
  • Prior use of bifocal or progressive lenses
  • Prior use of rigid gas permeable lenses and Ortho-K lenses
  Contacts and Locations
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Please refer to this study by its identifier: NCT00919334

Optometry Clinic, School of Optometry, The Hong Kong PolyU
Hong Kong, China
Sponsors and Collaborators
The Hong Kong Polytechnic University
Principal Investigator: Carly SY Lam, PhD School of Optometry, The Hong Kong PolyU
  More Information

Responsible Party: Carly Lam, Head of School, The Hong Kong Polytechnic University Identifier: NCT00919334     History of Changes
Other Study ID Numbers: GRF5438/06M
Study First Received: June 11, 2009
Last Updated: July 2, 2014

Keywords provided by The Hong Kong Polytechnic University:
Myopia progression
Myopia control
Simultaneous vision
Myopic defocus

Additional relevant MeSH terms:
Refractive Errors
Eye Diseases processed this record on May 23, 2017