Comparative Study of Two Marketed Spherical Soft Contact Lenses

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 18 to 38 years old. * 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. * Be existing or successfully adapted users of soft contact lenses, but not currently wearing either of the study lenses being evaluated in this trial. * Require a visual correction in both eyes. * Require a prescription between +8.00D and -12.00D and have less than -0.75D of astigmatism in both eyes. * Achieve visual acuity of 20/25 or better in each eye with a spherical contact lens prescription. * Must be able to wear their lenses at least 10 working days over the next 2-weeks; \> 8 hours/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 Grade 2 or above: 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: * Greater than 0.50D of refractive astigmatism in either eye. * Presbyopic or current monovision contact lens wear. * Cannot be currently wearing of either lenses (Avaira or Oasys) * Presence of clinically significant (grade 2-4) 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) worse than Grade 1; 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 20/30. * Aphakia, Keratoconus or a highly irregular cornea To be eligible to enter the study, subjects must have ALL of the inclusion criteria and NONE of the exclusion criteria present.