Evaluation of Comfilcon A and Senofilcon A Lenses

Inclusion Criteria: Subjects must satisfy the following conditions prior to inclusion in the study: * Has had an oculo-visual examination in the last two years * Is at least 18 years of age and has full legal capacity to volunteer * Has read and understood the information consent letter * Is willing and able to follow instructions and maintain the appointment schedule * Is correctable to a visual acuity of 20/30 or better (in each eye) with their habitual vision correction * Currently wears soft contact lenses at least 3 days a week, 8 hours a day * Has clear corneas and no active ocular disease * Has not worn lenses for at least 12 hours before the examination * 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 * Has prescription to match the available power range. Exclusion Criteria: Any of the following will render a subject ineligible for inclusion: * Greater than 0.75 of refractive astigmatism in either eye * Has never worn contact lenses before * Wears contact lenses on an extended wear basis * Has any systemic disease affecting ocular health * Is a known sufferer of ocular allergies * Is taking medication, such as oral antihistamines, antihistamine eye drops, oral and ophthalmic beta-adrenergic blockers (e.g. Propanolol, Timolol), anticholinergics, oral steroids and any prescribed or over-the-counter eye medication, except artificial tears or eye lubricants * Has any clinically significant lid or conjunctival abnormalities, neovascularization, corneal scars or corneal opacities * Is aphakic * Has undergone corneal refractive surgery. * Is wearing monovision * Is participating in any other type of clinical or research study * Female who is currently pregnant or is breast-feeding * Has \> grade 1 ocular corneal staining in both type and extent by \> grade 2 in either type or extent