Performance of Wearers of Stenfilcon A Contact Lenses After A Refit With Test Lenses

Inclusion Criteria: A person is eligible for inclusion in the study if he/she: * Is between 18 and 35 years of age (inclusive) * Has read and signed the informed consent letter * Is willing and anticipated to follow instructions and maintain the appointment schedule * Habitually wears soft spherical contact lenses with a power between -1.00D to -6.00D (inclusive) for a minimum 5 days per week, 10 hours per day and anticipates no difficulty wearing contact lenses for 7 days per week, 10 hours per day. * Habitually wears or is able to be adequately refit into MyDay Sphere lenses * Demonstrates an acceptable fit with the study lenses * Is correctable to a distance visual acuity of 0.20 logMAR (approximately 20/30) or better (in each eye) with the study contact lenses * Uses digital devices, (e.g. computer, tablet, smart phone, iPad), for more than 4 hours a day, 5 days a week. * Manifest cylindrical spectacle refraction does not exceed -0.75DC in either eye * Has clear corneas and no active ocular disease * Has a contact lens refraction that fits within the available parameters of the study lenses. Exclusion Criteria: A person will be excluded from the study if he/she: * Is participating in any concurrent clinical research study * Has a history of not achieving comfortable CL wear (5 days per week; \> 8 hours/day) * Has a systemic condition that, in the opinion of the investigator, may affect the study measures * Is using any systemic or topical medications that in the opinion of the investigator may affect the study measures. * Presents with slit lamp findings or clinically significant anterior segment abnormalities that would contraindicate contact lens wear such as: * Pathological dry eye or associated findings * Significant 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 (or history in past year) * Seborrheic eczema of eyelid region, Seborrheic conjunctivitis * History of corneal ulcers or fungal infections * Poor personal hygiene * Has a known history of corneal hypoesthesia (reduced corneal sensitivity) * Has a known sensitivity to the diagnostic pharmaceuticals to be used in the study * Has aphakia, keratoconus or a highly irregular cornea. * Has presbyopia or has dependence on spectacles for near work over the contact lenses. * Has undergone refractive surgery. * Is pregnant, lactating or planning a pregnancy (by verbal communication) at the time of enrollment * Has participated in any other type of eye related clinical or research study within the last 7 days * Is habitually using rewetting/ lubricating eye drops (more than once per day)