clinical performance of existing wearers of enfilcon a following a refit with fanfilcon a lenses for 4 weeks

Conditions: Myopia

Summary: the aim of this dispensing study is to evaluate the clinical performance of habitual wearers of enfilcon a lenses following a refit with fanfilcon a lenses over 4 weeks of daily wear.

this is a 30 subject, prospective, dispensing, bilateral wear, subject-masked study, reviewing the refit characteristics in a group of enfilcon a wearers switched to the fanfilcon a lens. subject's habitual enfilcon a lenses will be evaluated at the first vist and then re-fitted with a pair of fanfilcon a lenses for 4 weeks of daily wear. after the dispensing visit, subjects will return for evaluations at 1 week, 2 weeks, and 4 weeks.

Eligibility criteria:
inclusion criteria a person is eligible for inclusion in the study if he/she: * is between 18 and 40 years of age * has had a self-reported visual exam in the last two years * is an adapted enfilcon a contact lens wearer (at least 2 weeks in enfilcon a lens) * has a contact lens spherical prescription between -1.00 to - 6.00 * has a spectacle cylinder up to 0.75d (diopters) in each eye. * can achieve best corrected spectacle distance visual acuity of 20/25 (0.10 logmar) or better in each eye. * can achieve a distance visual acuity of 20/30 (0.18 logmar) or better in each eye with the study contact lenses. * has clear corneas and no active ocular disease * has read, understood, and signed the information consent letter. * patient contact lens refraction should fit within the available parameters of the study lenses. * is willing to comply with the wear schedule (at least 5 days per week, \> 8 hours/day assuming there are no contraindications for doing so). * is willing to comply with the visit schedule exclusion criteria a person will be excluded from the study if he/she: * is not a habitual wearer of enfilcon a lenses * has a cl (contact lens) prescription outside the range of the available parameters of the study lenses. * has a spectacle cylinder ≥1.00d of cylinder in either eye. * has a history of not achieving comfortable cl wear (5 days per week; \> 8 hours/day) * has contact lens best corrected distance vision worse than 20/25 (0.10 logmar) in either eye. * presence of clinically significant (grade 3-4) anterior segment abnormalities * presence of ocular or systemic disease or need of medications 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 of the limbus * giant papillary conjunctivitis (gcp) worse than grade 1 * anterior uveitis or iritis (past or present) * seborrheic eczema, seborrheic conjunctivitis * history of corneal ulcers or fungal infections * poor personal hygiene * has a known history of corneal hypoesthesia (reduced corneal sensitivity) * has aphakia, keratoconus or a highly irregular cornea. * has presbyopia or has dependence on spectacles for near work over the contact lenses. * has undergone corneal refractive surgery. * is participating in any other type of eye related clinical or research study.