A Prospective, Randomized, Double-blind, Parallel, Active-controlled Clinical Study of Silicone Hydrogel Monthly Soft Contact Lens for the Safety and Effectiveness in Visual Correction.

Inclusion Criteria: 1. 20 years old and above. 2. Subjects with normal eyes who are not using any ocular medications (excluding ocular lubricants and artificial tears). 3. Best spectacle corrected visual acuity greater than or equal to 1.0 for both eyes. 4. With +6.00D \~ -12.00 D spherical power, and ≦1.00 D astigmatism (based on subjective optometry measurements). 5. Have worn soft contact lens for at least 1 month prior to the study. 6. Willing to comply with the required wearing time and use specified contact lens care product. 7. Agree to comply with all study procedures and signed the informed consent form before enrollment. Exclusion Criteria: 1. Anterior chamber infection, inflammation, or abnormality. 2. Any active ocular disease that would affect contact lens wear or vision (such as acute and subacute inflammation of the anterior chamber of the eye, eye infection, uveitis, serious palpebral abnormality, corneal hypoesthesia, corneal epithelium abrasion, dry eye and tear duct defection, ocular allergies, highly suspected glaucoma) upon evaluation by the investigators or slit lamp findings. 3. Currently using systemic or ocular medications that would contraindicate with contact lens wear (such as, glaucoma eye drops, steroid anti-inflammatory drops, eye ointments, eye gels and other eye medicines). 4. History of herpes simplex keratitis. 5. History of refractive surgery, keratoconus, or irregular cornea. 6. Slit lamp findings that are not suitable for inclusion (Details of the grading standards for each eye condition are specified in CIP section 5.7.5 from page 38 to 43). 7. A pathologically dry eye syndrome (Schirmer test \< 5 mm). 8. Have participated in any contact lens or contact lens care product clinical trials within the previous 1 month (excluding questionnaire types and specimen collection). 9. Currently pregnant or lactation. 10. Allergy to any contact lens care product ingredient (such as mercury or topical antimicrobial agent). 11. Have experienced discomfort when wearing hydrogel contact lens. 12. Subjects who are judged unsuitable for the study by the investigators.