A Clinical Trial to Evaluate Investigational Silicone Hydrogel Contact Lenses Worn Continuously for One Week

Echo Ionic Silicone Hydrogel 6-Month Extended Wear Investigation

This study is a prospective, randomized, double-masked, bilateral, dispensing, parallel-group clinical trial design. All subjects will participate in a 2-week daily disposable contact lens adaptation period prior to being randomized into one of the four extended wear lenses. The study has a total of 9 scheduled study visits and a total duration of ~197 days. The lenses will be replaced with a fresh pair after 6 nights / 7 days of wear.

Inclusion Criteria:

• The subject must read and understand English and sign the STATEMENT OF INFORMED CONSENT and receive a fully executed copy of the form.
• The subject must appear able and willing to adhere to the instructions set forth in this clinical protocol.
• The subject must be at least 18 and no more than 39 years of age.
• The subject's spherical equivalent distance refraction must be in the range of -1.00 to -5.50 diopters in each eye.
• The subject's refractive cylinder must be less than 1.00 diopters in each eye.
• The subject must have best corrected visual acuity of 20/30 or better in each eye.
• The subject must be without history of contact lens use in the past 12 months.
• The subject must have normal eyes (i.e., no ocular medications or infections of any type).

Exclusion Criteria:

• Any previous experience wearing contact lenses on an overnight or extended wear basis (at least 1 night per month)
• Currently pregnant or lactating (self reported) (subjects who become pregnant during the study will be discontinued).
• Currently a regular smoker (1 or more times per month).
• Current routine swimmer (1 or more times per month).
• Any ocular or systemic allergies or diseases that may interfere with contact lens wear.
• Any systemic disease (ex. Sjögren's Syndrome), autoimmune disease (ex. rheumatoid arthritis), or use of medication (ex. chronic steroid use), which may interfere with contact lens wear.
• Entropion, ectropion, extrusions, chalazia, recurrent styes, glaucoma, history of recurrent corneal erosions, aphakia, or moderate or above corneal distortion by keratometry.
• Any previous or planned, ocular or interocular surgery (e.g., radial keratotomy, photorefractive keratectomy (PRK), laser in situ keratomileusis (LASIK), etc.).
• Any grade 3 or greater slit lamp findings (e.g., edema, corneal neovascularization, corneal staining, tarsal abnormalities, conjunctival injection) on the FDA classification scale, any previous history or signs of a contact lens-related corneal inflammatory event (e.g., past peripheral ulcer or round peripheral scar), or any other ocular abnormality that may contraindicate contact lens wear.
• Any ocular infection.
• Any corneal distortion resulting from previous hard or rigid gas permeable contact lens wear.
• Participation in any contact lens or lens care product clinical trial within 7 days prior to study enrollment.
• History of binocular vision abnormality or strabismus.
• Any infectious disease (e.g., hepatitis, tuberculosis) or a contagious immunosuppressive disease (e.g., HIV) by self report).
• Employee of investigational clinic (e.g., Investigator, Coordinator, Technician).