Clinical Performance of Stenfilcon A Versus Filcon II 3

Inclusion Criteria: Subjects must satisfy the following conditions prior to inclusion in the study: * Based on his/her knowledge, must be in good general health. Be of legal age (18 years) or older. * Be able and willing to adhere to the instructions set forth in this protocol and complete all specified evaluation. * Read, indicate understanding of, and sign Written Informed Consent (Appendix 1) * Require a contact lens prescription between -0.50 and -6.00 and have no more than -.75dioptor (D) of astigmatism in both eyes * Achieve visual acuity of 6/9 or better in each eye with a spherical contact lens prescription. * An existing soft contact lens wearer of any modality. * Must be able to wear their lenses at least 6 full days over the 7 days; 14 hours per day, assuming there are no contraindications for doing so. * Have normal eyes with no evidence of abnormality or disease. For the purposes of this study a normal eye is defined as one having: * No amblyopia. * No evidence of lid abnormality or infection (e.g. entropion, ectropion, chalazia, recurrent styes). * No clinically significant slit lamp findings (e.g. infiltrates or other slit lamp findings greater than Grade 2: corneal edema, tarsal abnormalities, and conjunctival injection). * No other active ocular disease (e.g. glaucoma, history of recurrent corneal erosions, cornea \[infiltrates\], conjunctiva, lids, and intraocular infection or inflammation of an allergic, bacterial, or viral etiology.) * No aphakia Exclusion Criteria: Any of the following will render a subject ineligible for inclusion: * Neophytes, who have not worn lenses before * Greater than 0.75D of refractive astigmatism in either eye * Presence of clinically significant (grade 3 or above) anterior segment abnormalities; inflammations such as iritis; or any infection of the eye, lids, or associated structures. * Presence of ocular or systemic disease or need of medication which might interfere with contact lens wear. * Slit lamp findings that would contraindicate contact lens wear such as: * Pathological dry eye or associated findings * Pterygium, pinguecula or corneal scars within the visual axis * Neovascularization \> 0.75 mm in from the limbus * Giant papillary conjunctivitis (GPC) Grade 3 or above * Anterior uveitis or iritis (past or present) * Seborrheic eczema, seborrheic conjunctivitis * History of corneal ulcer or fungal infections * Poor personal hygiene * A known history of corneal hypoesthesia (reduced corneal sensitivity). * Contact lens best corrected Snellen visual acuities (VA) worse than 6/9 * Aphakia, Keratoconus or a highly irregular cornea