clinical performance of habitual wearers of avaira toric when refitted with clariti toric lenses

Conditions: Astigmatism

Summary: the aim of this dispensing study is to evaluate the clinical performance of existing wearers of avaira toric lenses following a refit with clariti toric over 1 month of daily wear.

this is a 30-subject, prospective dispensing study comparing the clinical performance of the subjects' habitual avaira toric lenses following a refit with clariti toric lenses. subject's habitual avaira toric lenses will be evaluated at the first visit and then re-fitted with a pair of clariti toric lenses for 1 month of daily wear. after the dispensing visit, subjects will return for evaluations at 1 week, 2 weeks and 4 weeks.

Eligibility criteria:
inclusion criteria: * is between 18 and 40 years of age (inclusive) * has had a self-reported visual exam in the last two years * is an adapted avaira toric contact lens (cl) wearer (at least 1 week of wear in avaira toric) * has a contact lens spherical prescription between +6.00 to - 8.00 (inclusive) * have no less than 0.75d of astigmatism and no more than 1.75 d in both eyes. * 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: * is not a habitual wearer of avaira toric lenses * has a cl prescription outside the range of the available parameters of the study lenses. * has a spectacle cylinder less than -0.75d or more than -1.75 d 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 2-4) 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.