In Hong Kong, approximately 80% of children are myopic by the end of childhood. There is intense interest currently in the potential role of peripheral defocus as a clinical treatment to slow myopia progression. One of the most successful treatments for myopia is orthokeratology. Currently, Breath-O correct lenses are new designed ready-made orthokeratology lenses. This study is to evaluate the safety of wearing this new orthokeratology lens and the effectiveness of clinical performance in young adult.
Short-sightedness (myopia) is the most common refractive error in the world. In Hong Kong, approximately 80% of children are myopic by the end of childhood. Current treatment strategies to control (i.e. slow) myopia progression in children are primarily designed to harness the natural "emmetropization" process, in which visual feedback from retinal image clarity regulates the rate of eye growth. There is intense interest currently in the potential role of peripheral defocus as a clinical treatment to slow myopia progression, not least since this approach permits clear central vision. One of the most successful treatments for myopia is orthokeratology, which is a therapy of using custom-made rigid gas permeable contact lens. The special design of this contact lens can reshape the corneal profile to minimize the central refractive error while producing beneficial peripheral defocus. Currently, Breath-O correct lenses are new designed ready-made orthokeratology lenses which are made of new material with more elasticity as compared traditional lens material. This study is to evaluate the safety of wearing this new orthokeratology lens and the effectiveness of clinical performance in young adult.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
31
Breath-O correct lenses are new designed ready-made orthokeratology lenses which are made of new material with more elasticity as compared traditional lens material
The Hong Kong Polytechnic University
Hong Kong, Hong Kong
Corneal Biomechanics in Terms of Corneal Hysteresis and Resistance Factor
measured by ocular response analyser
Time frame: Baseline, 1st Month, 3rd Month
Corneal Endothelial Health in Terms of Endothelial Cell Density
measured by specular microscope
Time frame: Baseline, 1st Month, 3rd Month
Corneal Endothelial Health in Terms of Percentage of Variation in Cell Size
measured by specular microscope
Time frame: Baseline, 1st Month, 3rd Month
Anterior Ocular Health in Terms of Limbal and Bulbar Redness
measured by OCULUS Keratograph® 5M and graded by JENVIS redness grading system It is a scale of 0 to 4, the higher the score, the more redness the ocular surface manifests
Time frame: Baseline, 1st Month, 3rd Month
Anterior Ocular Surface Evaluation in Terms of Non-invasive Keratography Break-up Time (NIKBUT)
measured by OCULUS Keratograph® 5M
Time frame: Baseline, 1st Month, 3rd Month
Best Corrected Visual Acuity in Terms of High and Low Contrast
The best corrected visual acuity was measured in LogMAR (Snellen 20/20 vision = 0.00 in LogMAR ; each readable letter add -0.02 to the score, the smaller the number i.e. more negative, the better visual acuity)
Time frame: Baseline, 1st Month and the 3rd Month
Reduction of the Refractive Power After Wearing the Breath-O-correct Lens
Refractive errors were determined by subjective refraction for treatment group (Breath-O correct lens wearer), the outcome was represented as mean spherical equivalent refraction with unit in diopter (SER, = 1/2 Cylindrical power + spherical power)
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Time frame: Baseline, 1st Week, 1st Month, 3rd Month