Monthly Replacement Orthokeratology for Myopia Control in Existing Lens Wearers (MR1)
Myopic Progression
About this trial
This is an interventional treatment trial for Myopic Progression focused on measuring Myopia progression, Orthokeratology, Replacement modality, Surface deposits
Eligibility Criteria
Inclusion Criteria:
- Aged 8-15 years
- Have completed a two-year myopia control study using ortho-k
- Normal ocular and general condition and not on medication which may contraindicate ortho-k lens wear
- Pre-ortho-k refractive sphere between -0.75 to -4.00 DS, refractive cylinder ≤ -1.50 DC and anisometropia ≤ -1.00 D
- Best correctable vision better than 0.08 logMAR in the worse eye
- Normal binocular function and accommodative status
Exclusion Criteria:
- Strabismus at distance or near
- Contraindication for ortho-k lens wear
- Prior history of ocular surgery, trauma, or chronic ocular disease
- Systemic or ocular conditions that may interfere refractive development
- Systemic or ocular conditions that may interfere tear quality and contact lens wear
- Poor response to the use of study lenses
- Poor compliance to test procedures
- Poor compliance to the use of ortho-k lenses (e.g. use of solution, use of lenses)
- Poor compliance to follow-up schedule
Sites / Locations
- School of Optometry, The Hong Kong Polytechnic University
Arms of the Study
Arm 1
Arm 2
Arm 3
Experimental
Active Comparator
Active Comparator
Monthly replacement orthokeratology without protein removal
Monthly replacement lenses with weekly protein removal
Yearly replacement lenses with weekly protein removal
Subjects will be required to perform daily cleaning for the monthly replacement orthokeratology lenses
Subjects will be required to perform both daily cleaning and weekly protein removal for the monthly replacement orthokeratology lenses
Subjects will be prescribed with orthokeratology lenses which will be replaced at least every 12 months during the study period. They will be required to perform both daily cleaning and weekly protein removal for their lenses.