Myopia Control With Simultaneous Vision Approach
To determine if the 'Defocus Incorporated Soft Contact' (DISC) lens slows myopia progression in Hong Kong schoolchildren using simultaneous vision approach.
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Treatment
|Official Title:||Control of Myopia Progression in Myopic Children Using Simultaneous Vision Approach|
- The changes of cycloplegic refractive errors [ Time Frame: every 6 months for 2 years ] [ Designated as safety issue: No ]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.
- The changes of axial length [ Time Frame: every 6 months for 2 years ] [ Designated as safety issue: No ]Axial length was measured after cycloplegia using IOL Master
|Study Start Date:||July 2007|
|Study Completion Date:||June 2011|
|Primary Completion Date:||January 2011 (Final data collection date for primary outcome measure)|
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
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.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00919334
|Optometry Clinic, School of Optometry, The Hong Kong PolyU|
|Hong Kong, China|
|Principal Investigator:||Carly SY Lam, PhD||School of Optometry, The Hong Kong PolyU|