Clinical Performance of Existing Wearers of Avaira Sphere Following a Refit With Clariti Elite Sphere

Not Applicable

Completed

Brief Summary: The aim of this dispensing study is to evaluate the clinical performance of existing wearers of Avaira sphere lenses following a refit with Clariti Elite sphere over 4 weeks of daily wear.

Detailed Description: This is a 30-subject, prospective dispensing study comparing the clinical performance of the subjects' habitual Avaira sphere lenses following a refit with Clariti Elite sphere lenses. Subject's habitual Avaira sphere lenses will be evaluated at the first visit and then re-fitted with a pair of Clariti Elite sphere lenses for 4 weeks of daily wear. After the dispensing visit, subjects will return for evaluations at 1 week, 2 weeks and 4 weeks.

Recruitment & Eligibility

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 sphere contact lens (CL) wearer (at least 1 week in Avaira sphere)
Has a contact lens spherical prescription between -1.00 to - 6.00 (inclusive)
Has a spectacle cylinder up to 0.75D 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

Is not a habitual wearer of Avaira sphere lenses
Has a 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 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.

Arm && Interventions

Group	Intervention	Description
enfilcon A	somofilcon A	All participants are habitual wearers of enfilcon A lens and who are refitted with somofilcon A lens
somofilcon A	somofilcon A	All participants are habitual wearers of enfilcon A lens and who are refitted with somofilcon A lens

Primary Outcome Measures

Name	Time	Method
Visual Acuity - Enfilcon A and Somofilcon A	Baseline, 1 Week, 2 Week, 4 Week	Monocular and binocular logMAR visual acuity for enfilcon A / somofilcon A assessed at baseline and somofilcon A lenses assessed at 1 week, 2 week, 4 week.
Subjective Assessments. - Enfilcon A and Somofilcon A	Baseline, 1 Week, 2 Week, 4 Week	Subjective assessments for: comfort, dryness, handling, overall vision satisfaction, and eye whiteness. Enfilcon A was assessed at baseline and somofilcon A lenses assessed at 1 week, 2 week, 4 week. Scale(s): comfort (0=very poor; 10=excellent), dryness (0=very dry; 10=no dryness), handling (0=very difficult; 10=very easy), overall vision satisfaction (0=very unsatisfied; 10=very satisfied), habitual eye whiteness (0=not white; 10= totally white)

Secondary Outcome Measures