Clinical Research Directory

Inclusion Criteria: 1. Patient contact lens refraction should fit within the available parameters of the study lenses (spherical power within -4.00D and the cylinder power within 1.50D). 2. Is willing to comply with the wear and visit schedule. 3. Is willing to participate and signed the informed consent form. Exclusion Criteria: 1. Age under 8 years old 2. Any ocular abnormalities, undergone corneal surgery, or history of ocular trauma, active corneal infections (corneal inflammation), corneal curvature less than 40.00D or more than 46.00D 3. Best corrected visual acuity less than 1.0D 4. Pregnant, lactating or near-pregnancy 5. The eye has the following conditions: 1. Acute and subacute inflammations or infection of the anterior segment of the eye 2. Any eye disease, injury, or abnormality that affects the cornea, conjunctiva or eyelids, e.g. dacryocystitis, conjunctivitis, blepharitis and other inflammation, glaucoma, etc. 3. Severe insufficiency of tears (TBUT≤5s). 4. Allergy to any ingredient, such as mercury or thimerosal, in a solution which is to be used to care 5. Any active corneal infection (bacterial, fungal or viral). 6. Manifested strabismus 7. Abnormal intra-ocular pressure 8. Suffering from systemic diseases, resulting in low immunity, or affecting corneal re-shaping (such as acute and chronic sinusitis, diabetes, Down syndrome, rheumatoid arthritis, mental patients, etc.) 9. Under medications or long-term medications that lead to dry eye with clinical signs or affects vision and corneal curvature. 10. Examination result indicate any contraindication or not suitable for OrthoK lens wear 11. Participated in pharmaceutical clinical study 3 months before the date of the screening or participated any other medical devices research study within 30 days of the screening 12. Only eye fulfills inclusion criteria 13. History of any ocular operations 14. Unable to follow investigator's instruction 15. Any other condition not suitable for the study per investigator's judgement