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